They're a contender, as long as Curry and Bogut stay reasonably healthy. And they match up with Miami as well as anyone else in the league. They have three guys to throw on LeBron, in Barnes, Draymond Green, and little used Richard Jefferson. That's 18 fouls, and Green has shown that he more than willing to get in LBJ's face.
Lee needs to get healthy for them to have a true chance to beat Miami. They beat Miami in Miami early in the year with Curry, by two on a late Green bucket, but lost badly later at home, sans Curry and Bogut.
As I mentioned in another thread, if they had the ballls to pull off the Pierce for Harrison Barnes and Biedrins deal at the deadline, they'd be a lot better positioned for a title right now. They don't have a closer and they don't run any half court offense out of anyone but their PG. PP could hav been perfect for them t he next three years, now that they're a title contender. And yes they would have given up a nice long term asset, but even if Barnes developed into an all star, they can't have all three starting littles making max or near max money. Add Pierce's half court offense, three point shooting and leadership to this team, and look out.