I might agree if that was actually the case. What about aura effects? They hit automatically, every time. How fun is that?
Fun is about psychology. Auras are auto-hit. But, that doesn't matter because players EXPECT them to be auto-hit. Players can do things to avoid them completely. If I immobilize a foe and move away, the aura can't get me.
A roll to hit with a ranged power that hits on a 2 is not expected by players. There is little they can do to avoid this.
It's this psychology of expectations and ability to avoid which makes all of the difference between having fun and being frustrated.
And: Where are you pulling those numbers from? Picking a single monster shows nil.
But I'm already getting incredibly tired because that's what the old debate was all about and it's been repeated a bazillion times, already.
I remain unconvinced until I've had real playtesting experience with real encounters with a real group of pcs.
'Doing the math' will never be able to show you what the playing experience will be like. If it could, then why isn't there a program, already, that covers every aspect of 4E combat? (see the thread about applying the Monte-Carlo method to simulate 4E combat)
Picking examples won't prove anything. Ignoring items, powers, terrain, and tactics definitely won't.
Doing the math is better than doing nothing.
Obviously, playtesting experience is important.
But ignoring the math completely is silly. The math doesn't change that much, just because someone is playing the game. And, many intelligent people doing the math DO combine it with playtesting experience. You act as if it is one or the other. The first thing I did when I saw the math issues was ran a level 22 encounter.
If WotC would have ignored the math, they wouldn't have changed the masterwork heavy armor modifiers and added +4 Epic NAD feats and the Expertise feats.
Your POV that there are no math issues is not sustainable precisely because WotC added +3 to hit and +4+ to NAD defenses into the game on a D20 system. Those are HUGE percentages and WotC claimed before the 4E release that they wouldn't be adding in huge adds to hit. Now, they did.
Obviously, they did it for a reason. If there are no math issues because of the synergies of powers and items and feats, then WotC did it to break the system. That seems doubtful.
This concept that WotC got it correct right out of the gate is silly. Having been in programming for nearly 30 years, I know from experience that version 1.0 of any system will always have bugs. Always.