Well it really depends. There are some actors that are type-casted so it's not like.. i'm not going to watch a movie that sounds good because said actor is there. It's more that, because said actor is in a comedy movie, and their form of comedy tends to be not my liking, i'll probably not watch it. A good example for me is jim carey. I don't like movies like dumb and dumber or ace ventura, so i tend to be wary of movies with high level plot who use jim carey. That being said, I was amazed with eternal sunshine and thoroughly enjoyed the truman show. But it took something like the truman show to watch eternal sunshine in the theaters.