Likewise. The single biggest thing that turned me off was that I had a DM who halved all the monster HP and doubled their damage to "speed up combat." That's partly a DM issue but it was apparently common advice for 4E DMs, encouraged partly by 4E already having divergent rules for PCs and monsters.And if that's how 4E was presented, and actually played, then I would have significantly fewer problems with it. Really, I only ever had three or four issues (and only one or two dealbreakers) when it came to 4E, but the guarantee that there must be exactly one mechanical representation of any fictional element was right at the top of the list.
If you got rid of monsters that changed stats depending on your level, and the different math for PCs and NPCs - I don't mind if NPCs are simpler, as long as they have the same HP and bonuses - then I would consider the game almost playable.
Consistent, coherent game physics are a must for me.