I must admit that I have little to no interest in a Guardians movie.  I only remember them from their first appearance in Marvel Super Heroes and know nothing of the new team.  Groot, a Kirby monster, is the only thing that looks appealing to me from this newline up - well, maybe Rocket Raccoon, too.
However, I will see it BECAUSE it is a Marvel movie, and I DO hope that I like it.  
I admit that I can not tell how much of my enjoyment of the other Marvel films is due to fact that these characters are finally being brought to the screen vs. how good the movie actually are.  This is not to say I like all "Marvel" character movies, just because they are Marvel, did not like the Ang Lee Hulk, nor Ghost Rider, Spider-Man 3, X-Men Origins Wolverine, and disappointed by a few of the others.
This will be a good test case for me.