Really not sure if this is worth a look, and I'd like to second Aliasalpha about the smurfs. I'm assuming they got picked because everyone knows that chapter?
I reckon smurfs get picked because they're easy. No codex deviations (other than the occasional "Ooh we fight tyranids so much we're slightly specialised, how rebellious!") means they just have to set up the genetically engineered super soldier (who are way cooler than any of the poser wannabe supersoldiers) and talk about the emperor a lot. With other chapters they have to set up additional information or lose the uniqueness of a non smurf chapter.
Blood Angels: Black rage & hints of gayness
Space Wolves: Wolfy viking tendencies & ladles of gayness
Dark Angels: The Fallen, deathwing, ravenwing & buckets of awesomeness