Scott Pilgrim and Kick Ass both lifted pretty much straight from the page and are both cult hits.
In fact let's be honest here. If the Thing and Doctor Doom had been cgi and the scarred ruler of Latveria respectively then the Fantastic Four would have held up a hell of a lot better.
You can adapt, fiddle, galvanise and adjust the costumes all you like after all artists have been doing it in the comics forever. But the basics and the soul has to be there.
Yes OK Batman wore armour in the films, but we know it's armour in the comics it just looks a little more armoury in the films. If the cape wasn't scalloped or the ears weren't there or they missed off the chest symbol or wrist spikes or utility belt then complain because it's something that's quintessential to the look of the character and the look of the character is a big part of what makes them come to life in an adaptation.
If Hawkeye is just going to wear a leather one piece (example) then he's just Hawkeye in name only. He's a superhero. Superheroes are supposed to be larger than life and make a statement. The only statement he seems to want to make is that he got lost on the way to the archery range.