However, even though bitchy, rich yuppies are not likable characters, the movie portrays them very accurately. Having spent some time with "these people", I felt the movie was incredibly honest and dealt with pertinent issues. Maybe not pertinent to you in particular, but pertinent to these types of people in this age group.
The acting is really superb. Chris Evans strips down his likable "flaming" side to become an annoying, ego-maniacal prick. Stratham gives a powerful performance, which for some reason screams of Bruce Willis's "finer" work. Biel is the weakest of the main actors, mostly due to the script edging her out of most of the movie. All the actors are right on the money with their characters. Within 10 minutes you start to feel like you've known them for years.
But beyond the drugs, beyond the obnoxious mannerisms, lies a story of a real relationship. By way of flashbacks, but we are given some great insights into how the relationship worked, and how it fell apart. The characters screwed it up, and its amazing watching Syd (Evans) re-live both his best and worst memories. That is the most essential and successful part of the film.