go watch "Megamind".  You'll see why evil shouldn't win.

It's just once it wins,we consider it "good".

I wouldn't agree that you can only have Iron Man vs big suit or Iron Man vs many suits. There's a story in the comics where Iron Man causes a plane to crash and finds himself at odds with the US government (and military). With this kind of story, you have a powerful adversary that Iron Man can't just punch or blow up since he'd be hurting fellow patriots, as well as an adversary that undercuts Tony Stark since his company and resources are under attack.

The second movie sort of sets this up in the sense that the government are starting to lose patience with Stark (that senator in particular). I really hope the third movie goes this route.

This would also be an opportunity to further establish SHIELD - their tech, their structure etc.

We discuss Shane Black quite a bit in the upcoming Iron Man 2 commentary.  We will discuss Nolan quite a bit when we go screaming through the Batman filmography, though I will say its not enough to just say "Nolan's batman is badly written," you have to be a bit more specific if you make that claim.  The notion you propose that comic books and superheroes is inherently unrealistic is a bit of a straw man, bordering on ad hominem.  Is Maus, the only comic to ever win a Pulitzer, unrealistic because it anthropomorphizes mice in lieu of holocaust survivors?  Technically yes,  but I would submit that it gets at a deeper truth.  This is to say nothing of comics like Pedro and Me, Don't Go Where I Can't Follow, Daytripper, Pride of Baghdad, and Strangers in Paradise which portray relationships in as real of a way as any other medium.  If you don't cotton up to capes and cowls too much, I understand, but don't throw the baby out with the bathwater.

...and by the way, as a new father, can I just say what an awful expression that is?

Makes sen, if they are going in the direction I think they're going.  If you're familiar with Bane, you get what I'm saying.