I wouldn't say I "dislike" 4E, per se; it's more that I'm strangely apathetic about it.
As a life-long D+D player (I'll date myself and say late-70's on), I just don't care for the direction the game is currently headed, both fluff AND crunch wise. And I don't see the need to shell out $90+ to get a new rules set when the 3.5/ Pathfinder set works for me and my group.
And, more importantly, I think that the way WotC handled the 9-month lead-up to 4E was poorly designed and executed. (Yes, perceptions of a company can DEFINTIELY impact people opinions.)
The fact that:
A) It's not really backwards-compatible is a drawback. (Hell, I find myself playing more Gamecube games than Wii games lately!!!)
B) The execution of this plan, from start to finish, was sloppy;
WotC had NINE MONTHS to "Wow" us with 4E; IMO, they made an Epic Fail. I feel, especially in the early stages, they really alienated fans (and possibly other publishers), with the removal of print Dungeon and Dragon magazines, and the annoucement (and subsequent delay) of the GSL.
Meanwhile, Digital Dungeon and Digital Dragon? While the contents remain largely the same as before, it's a PAIN to read online to me, especially when things are doled out in tiny increments. (And is it just me, or do they not even have compiled PDF issues!?)
C) The Digital Inititative/ Gleemax: Putting E-Dungeon and E-Dragon aside, the DI is a complete debacle. Gleemax remains unnavigatable and poorly designed and organized. And I think it's a real mistake to launch 4E without a usable online character generator, especially when they touted the online components as a "cornerstone of the 4E experience."