The amount of fun that you can have on a rogue has been steadily declining since WoW's release. The original stunlock is gone, Swirly Ball was removed without any warning, and the Dungeon Finder effectively killed stealth boss runs. There are no more random chests for us to unlock, and our lockpicking levels up automatically. In Cataclysm, for the first time since launch, there was no epic weapon to look forward to through pickpocketing.
Mists of Pandaria is bringing fun back. With just three little glyphs, I've had more fun in the past 48 hours than I've had in years. Glyph of Detection reintroduces Swirly Ball to our arsenal, after years of fervent lobbying for its return. Glyph of Decoy leaves a copy of you behind when you Vanish to distract your enemies, just like our old friend, Archmage Vargoth. Finally, Glyph of Disguise allows you to copy the appearance of any humanoid that you use Pick Pocket on. There is nothing more fun than flying around, looking for new appearances to steal. I will never forget the first person I ganked while disguised as Durn the Hungerer.
Gallery: Mists of Pandaria new rogue glyphs