(not really in order)
iRO - Too long, XD I think i'd bore everyone. Wasnt really my favorite experience. Had a rotten time and made almost no friends

old euphro - Was really fun. Met a really nice guild who let me in, even though I didnt meet level requirements. A kinda small guild, Soulfly being the leader and some other people. We had alot of fun messing around with eachother. Ahhh...good...good times.
new euphro - Only reason I played it for a month was cause I found Soulfly once again from when it went down.
TurtleRO - Was offered my first GM position here. It was fun I guess. Nothing really special now that I look back at the gone and ancient MR, but at the time I had a blast ;p
Generation Ragnarok - Didnt stay here too long. It was a new server, I tried it and it was OK. My friend Atrian made it, but did some foolish things I warned him things wouldnt end well if he went through with them.
Ancient RuinsRO - Probably the best RO experience of my life. The admin was impressively smart at what he did best. He was honest to the players, posted even the smallest updates, made everything be 99.9% bugless, had awsome scripts he made for the small community, and was an amazing spriter, ran everything on his own so there would never be corruption. He could make the toughest script you could think of and finish it in a week max, same thing with spriting. Absolutly great guy. I'm glad to have him as an upcoming player on my new-to-be server

RebirthRO - The admin was not too bright. Did everything for real money. How the admin profitted off the server so much with doing so little is beyond me. Unless you donated $100+ you couldnt be good in pvp, and if you didnt even donate you cant even reach max level unless you work for like 2 months hard-core.
ParadiseRO - Awsome server in its begining. Abel was fair then. After that Abel kind of did his/her own thing, which was not in any players interest. Kind of died after that.
SeriousRO - Friends from ParadiseRO made it. Absolutly great server, idk why it went down so fast. They had nearly a 50 player turnout on day one (no venders).
ForsakenRO - One of my favorite HR's. I was hated there, (known as Kingdom if you played there). I had alot of fun setting the brightest trends on the server. I started when about 5 people were online and watched it grow to 300. I was the one and only legandry stalker. After I got tired of that class and was finally bored, I tried Battle Priest. Oh boy, just after 4 days of that in pvp, how many new battle priests did I see in the game? Then, the last class I perfesionalised, Star Gladiator. On a HR this was impressive to dominate pvp with. I got alot of fame for these three classes, even GM'd for a week on the server, but quit the Event GM position seeing how corrupt the server was, and the admin didnt care. (Idc what Genesis says about me. I quit my position after warning him of some GM's and things going on and he just ingored me.)
Noob FuryRO - Didnt spend too much time here. Didnt find it very friendly after about a month.
WolfRO - A small and great community. Though I havent tried the new one im sure its better then the old.
old CeresRO - After the old euphro died I was convinced to come here. My very first HR. I learned new techniques and learned more and more about the game then I would on a LR. I wont release my name because of an imposter who has caused enough drama. At least the real people know im legit.
BlastRO - I played here for a little while. Wasnt great, but it was one of my first servers I played so I couldnt tell at the time

PopsicleRO - The GM's sure did make me laugh here. They may have made themselfs look unprofessional, but boy this server made me crack up. Arty, your a genius XD
old ApocolypseRO - A friend, Tomaso, told me to try it shortly after Ceres. Not too great. He liked it because GM's gave friends free items :x
PhoenixRO - My first server. It was a horrible server, I was the only person who played it, but I gained alot of knowledge on how eAthena worked, scripting, and how to run a server in making this. All in all, I think it was fantastic because it has helped me in the long run

VaranRO - Also one of my first servers. I loved it. Players were kind and helpful, never ran out of anything to do, and the GM's were 100% legit.
WoeRO - I have a woe fetish so I tried it out

I liked it of course because I love woe. Really I thought the community would be mean, but I was proven wrong. It turned out to be quite fun indeed.
SpawnRO - Found out it was like a dupe of popsicleRO without the good GM's :/
GaigeRO - I never thought highly of the admin, but it was an OK server. The community was half nice, half mean. I got bored in the end so I just left.
StyleRO
ValanceRO - My second server. This was my breakthrough from PhoenixRO. A nice steady population of 180 people. I was the only GM so things got kind of hectic, but I think I ran it smoothly and hopefully gave a nice experience to my players.
old CorpseRO - Ha, completly haloween based. My sister loved it and I did too. Everything was had to do with halloween. Even made a Halloween Town. I think this was the best thing since fried rice XD
GalaxyRO - A good server but nothing special. Made a few friends here and there but no one I keep in touch with today.
old ForbiddenRO - GM's turned out to be corrupt, but thought that once they got busted they could say "We work hard, we make it, so we decide what we do with the items, weither they go to friends or not".
RevengeRO - My new-to-be server. I play it so I can of course rave about it. But that would take days XD All in all, I think this is a revolutionary server unlike any other server out there not heavily modified into a whole new world (such as the new GalaxyRO)
XileRO - Not really that great :x The admin is nice I guess, but they rave about their population. 3,000+ people or something? Well for 4 (cant remember if its 4 or more) thats really nothing to rave about. The population treated me like dirt so I just kind of moved on.
PlanetRO - An OK server for a MR. I still dont believe the story that the admin was a drug dealer and got caught and put in jail, so thats why it just died...