I'm mostly dissapointed with Wizards. Although there are several possible combinations of at will powers and encounter powers. They start to look pretty similar, especially if it's a human wizard.
This won't stop me wanting to play one, as I like a roleplaying challenge.
I will be interested in seeing how 4th edition develops, with PHB2, the swordmage from Forgotten Realms players handbook and hopefully an arcane sourcebook.
Clerics have become a little bland, great healers though. I found Turning Undead, was not as effective as it used to be, but radiant damage is good.
But hopefully the Cleric will be enhanced with a Divine sourcebook and the Warlock (which i liked) will get more Pacts in an Arcane sourcebook.