While I think pretty much all of the relevant points have been made already, I think its also relevant to understand some of the underlying design principles of 4e. Namely the change to everything being an attack, and making the math through the levels a linear progression.
As I believe was mentioned above, with everything being an attack, each class HAS to be able to hit with their relevant attack (i.e. weapons for martial classes, spells for wizards, etc.). This coupled with the evening of the math led to the standard progression of attack (and everything else) that we see.
I agree with what others have said, the 'what' of attacks (the relevant attack bonus) isn't the important part (since everyone needs to be able to hit with their particular tricks), it's the 'how' of attacks that is what's important (the powers, feats, and other modifiers).
Personally I just like that I can now make a wizard who may be proficient with the longsword and he can, given a relatively decent str score, actually expect to hit even at higher levels.