Personally, I just feel like ranged classes in general win at RO. Gunslingers included. Fighting at range is remarkably newbie-friendly, because you tend not to get hit. Especially if you pick your targets with a little care, such as leveling up on immobile enemies from way the heck outside their attack range.
I remember playing a Gunslinger on a high-rate server. Sure, MVP's could one shot me. If they reached melee. But I could critlock them with blinding aspd to the point that I could solo anything that didn't shoot back. No MVP cards, no super rare drop equips. Just point and click.