Okay, USM rant ahead since we're on the topic....
I've always hated Bendis' minimalist, snail-pace scripting based on the sort of arrogant false premise that, that is what dialogue "really sounds like." His plots aren't bad, but his dialogue is often painful and what makes it worse is how criminally overrated it is. I've seen him basically fill up a whole page with exchanges that have about as much substance and weight as this fake one I'm about to post:
MJ: Hey...
Peter: Hey...
MJ: So, I...
Peter: Yeah... ?
MJ: Wait, did you really mean it when you said...?
Peter: I....
*Bell rings*
MJ: I have to go.
Peter: But....
MJ: Bye.
Peter: Fine.
Now, that may be a crude parody, but the reason it's so open to parody, is because this so-called realistic scripting is deadly to the pacing. Conversations never went anywhere, or if they did it took twice as long to get to their point. Every panel and word balloon should have a purpose and be moving the plot forward, just as the same rule applies to film insomuch as every scene of a good film has a purpose. Bendis often seems aimless, plodding and too knowingly in love with his rep. Sure, over-exposition in word balloons has the potential to come off as wooden and fake, but plenty of more talented writers find the right balance between realism and expediency when scripting their stories. Look at any Alan Moore comic. The dialogue reads very realistic, but it also gets straight to the point and isn't meandering and dull.
Meehaul, you sure put me off on a tangent talking about Bendis.

That is one reason why I personally dislike USM, but I think the reason you may dislike it is because teen Peter in USM lacks the weird factor and slight creepiness that Ditko instilled in Peter with the early ASM issues. If this is in fact your point (and if not, apologies), then I would also agree. Peter comes off as geeky, but non-threatening. In fact, he is almost written as the oxymoron that has come to be known as the "cool geek." He is lonely and misunderstood, but lacking an edge or any darkness that might spring from those feelings. He is safe-for-kids, and he reads like a product of the Gen-Y emo culture, cultivated from the same youth-scene that gave us the Jonas Brothers and the Twilight movie. In short, it's terrible and totally misses the interpretation that one of Spidey's Daddies envisioned him as.