Hi Negflar!
Making the sweet spot mathematically present at every level can be grossly represented by me playing a wizard. I will launch a magic missile at a zombie at low levels, or a meteor swarm at a multiverse entity at high levels, but basically, mechanically, I will still roll d20 to make a 10+ and roll some dice on damage that will represent the same proportion of HP on damage average of the creature. Mechanically, that is the same thing, the variety being expressed here in flavor only.
I wager that you do appreciate this variety, and there's absolutely nothing wrong with that. Other players want to have variety in terms of probabilities and mechanics. They want more than 4e provides in that area. For them, 4e becomes tedious very quickly.
I think that more broadly this comes down to the notion of what "fun" is. If you agree with the definitions of "fun" 4e tries to provide you will be a very happy camper indeed. If however, say, you enjoy learning the intricacies of a game system and enjoy differentiating good from bad mechanical choices in terms of character building, you're out of luck as far as the comparison between 4e and earlier editions goes.
Some players will think of the Incredibles: "If everyone's special, then no one is."
You appreciate these aspects none the less because they fulfill something you were looking for in D&D. Now you've got it. Same thing about teamwork and tactical game play. I dare say, you are exactly the public Wizards was trying to appeal to when publishing 4e. And that's totally fine with me.
Now, I think you also can understand that many players out there are not you. That many players have different needs and wants as far as D&D is concerned. Sometimes, these needs and wants will converge with 4e's offerings, and sometimes they won't.
My point, in fact, is that 4e is extremely good at doing what it's set out to do, but not much else. On purpose. People who craved what 4e decides should be D&D's game play experience will be ecstatic about it, such as you seem to be - and it's totally okay, once again. Others won't, because that's not what they value in D&D's game play experience. That should come as no surprise, given the way 4e is such a focused game system.