Sigh.
You don't need agi on a PvP/WoE oriented gunslinger. You're not going to take anyone down by ctrl+clicking. Bleeding is a s*** status ailment. Flee is useless, yadayada. Therefore, you'd only need to invest your stat points in 4 stats, dex>vit>str>int. You can get 130 dex while sporting 97vit (which nets you about 10k hp) and 3x base str for weight capacity.
There are only 3 skills worth using in WoE/PvP and these are: Desperado, Full Buster and Bullet Shower. Dealing 550% per hit(for a maximum of 5500%), 1300% and 1000% respectively. FB deals better damage than Falcon Assault agaisnt geared opponents and in PvM due to the fact that it can be endowed. So in the burst damage department, the GS takes the cake. Desperado has the potential to deal as much burst damage as an EDP SB, and while they are not given weapons comparable to slotted infils (though they do have something nifty to take advantage of, which I will talk about later) with bragi (which you should have in WoE), your general DPS is much greater (than a WS' even!). The only obvious downside is that you will not be wearing a thara while using the skill, and it forces you into melee position, but if inside a mob or a recalled party, you will be able to get a few kills before people spread out and are able to target you amidst the mass. When using FB and BS though, the lack of thara is as much of an hindrance as it is to Snipers while they're DSing. Fact is, you shouldn't be using DS/FB/BS in close range, in which case you can switch to your shield, so the lack of thara is a moot point if you're any decent of a player.
Now about the little trick I made allusion to earlier... We know that you need a pistol type weapon to initiate desperado, but you may switch to any other type of weapon right after using the skill and the latter will take said weapon into account. A bit like a Clown who would cast AV on something and rapidly switch to an ice pick, thus making his AV's dmg depend on his STR. One way GSes can take advantage of that is by switching off to the strongest weapon available to them, and that is the inferno (grenade launcher). The latter also has elemental spheres that it can use, which greatly helps with Desperado's dmg in PvM.
With an Abysmal knight carded Inferno, and blind spheres (shadow element), you'd deal an average of 11517dmg per hit on Angeling, which has 55k hp. That basically means that you can one shot angeling on average. With a similar setup, you can take Eddga down in 4 seconds, GTB in 8s, Arc Angeling in 9s, Ghostring in 6s, Kasa in 2s, Necromancer in 5s, Ktullanux in a little less than 3mins (with Desp dealing 34k on average), Moonie in 3s.... Valkyrie Randgris in 96s. All of these values being average times, and that's without even considering bragi which basically halves everything. While the class does require extra support to function (sw spam+bragi), it is nonetheless a serious contender in damage dealing potential, and is thus one of the best mob clearers in the game.
Back to WoE, thats a spammable 2750%(avg) AoE skill with a 1 second delay reducable by bragi. What is there not to love? I don't really understand why people are akin to compare them to Snipers when they don't even fill in the same roles. Snipers trap, deal status ailments with FAS and AS and support dmg with DS and FA. GSes beat Snipers in the support damage department, but they don't have traps nor are they any good at dealing statuses. In all honesty, I don't see how traps are that great, though it really depends on the castle, and type of WoE (FE vs SE). In SE, traps are nigh useless because of the wide areas, and in FE, once the traps have been walked over, there is nothing you can do other than wait till your guild cleared everybody around your emp room so that you can set your traps again; in other words, in a field battle, traps are pretty useless too. GS does shine a lot more in field battles with Desperado and better overall dmging potential.
And no GS is going to die to 1 AB if he's even remotely geared for WoE. AB does not deal 10k.
And then there's disarm, which, while not having that great of a success rate, is the only ranged divesting move in the game.
Some people should either 1.play the damn class or 2.inform themselves before spewing BS.