I'll play Devils Advocate ........
The whole no simultaneous Voice & Data not being a big enough talking point is complete crap, at least in MacRumors and other forums. Not that anyone should be a complete dick about it, but to sweep it under the rug as if it's not a disadvantage is retarded.
The iPhone has been criticized for every little slightest infraction from iOS, hardware, down to ATT's network itself.
Now that the iPhone has some pros on ATT vs Verizon, so many are quick to down play it.
Sure in real life some of the pros & cons might not mean much to the average user. But I've already seen the same users that in the past have posted complicated benchmark links against the iPhone and now all of the sudden claim simultaneous Voice & Data doesn't mean anything.
Just admit it's a minor setback.