Captain America is either going to be utter trash or simply awesome, I can't envision a situation where it goes any other way but to an extreme of the scale. I think my ridiculous fondness for Chris Evans after Losers and Scott Pilgrim will steer me towards the "OMG AWESOME!" side of the fence no matter what though.
Thor looks like it's shaping up to be pretty tasty, and given Edgar Wright's track record then I can only assume that Ant Man will be pretty sweet as well. However nothing but the cast for Avengers fills me with confidence. I've never really cared for the Avengers, any of their line ups in fact, and Joss Whedon is a complete hack--especially when he's been entrusted with the characters of other people in the past. None of that really adds up to interest beyond the "let's see what kind of train wreck this becomes" variety.