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You're also a little low. At level 8 your AC should be: 10 + 4 (1/2 level) + 5 (CON/WIS mod) + 3 (hide) + 2 (enhancement bonus). That's 24 or 23 if you have only +1 armor.
In addition to all that's been mentioned above:
1. Team-based play: the party is a team with different roles that need to work together or you end up with probable TPK. No more of you need two specific classes and the rest are filler.
2. Interactive powers: you do something that someone else...
Thrilled he's gone--didn't like 3e, didn't like his ideas for Next. I do think the sudden release of the playtest is damage control over his departure but unless the rules have changed mightily since I last saw them about two months ago, I think it's gonna bomb.
4e made teamwork and party play the main factor in winning an encounter by having different roles, balancing classes, conditions other characters can take advantage of, and out-of-turn powers to influence actions by or on other characters. So far nothing has been said about keeping this...