I finally watched it and I find it to be a rare, solid fun space sci-fi. Definitely one of the best Marvel films, but I'd still put it behind Iron Man, CA: Winter Soldier and Avengers.
TBH I really enjoyed it and it blended humor, action, cheesy friendship and anti-cliche tropes wonderfully, but I guess it's not the type that I will fangirl over.
Edit: I have no rating yet for this film, but definitely around 8.5-9/10