6 years ago I quit Final Fantasy XI to play World of Warcraft with my cousin. In FFXI I played a Thief/Ninja so when I switched I chose the closest class in WoW to that. Thus my rogue was born. This was the first toon I have ever rolled and to this day, now six years later, I am still here playing this same rogue. I have tried playing and leveling other classes, but I always get them to a certain point and think "I would rather go do XYZ achievement, dungeon, etc. on my rogue than this." I play a rogue. Pure and simple. I am not going to be switching classes.
This is what I find fun. The stealth gameplay, the pick pocketing (and vanity items from it!), etc. However, with the release of MoP, I am just not enjoying playing my rogue anymore. Don't get me wrong. I am still enjoying WoW in general (give the man who voices Loremaster Cho a high-five!), but the rogue gameplay and mechanics are frustrating and annoying. The rogue class is simply not fun. With the strong focus on making the game 'fun' that was preached before release I honestly expected much better. Run-on sentences aside; something really needs to be done. Playing my class should be exciting and enjoyable. It should not make me angry, frustrated, or annoyed simply by the way my class is meant to be played.
I am not an elite raider or PvPer, but I do enjoy both and wish to participate in both. I am not a number cruncher or min/maxer; I simply want to have fun with my friends. Can you make that possible?
TL;DR: Long time rogue. Rogue gameplay in MoP is just not fun.