I have been torn about this film since it was first announced. As someone who's had a rocky relationship with Marvel, I'm not sure I can trust them. You may be asking yourself, "What? Rocky relationship? But it's Marvel, they're awesome"! Well I thought so too, until I saw The Avengers at midnight at PI....they let me down so much with that film. It could have been me over hyping the film, but I stand by the fact that thanks to the marketing, I was sold a completely different Avengers movie. If you go back and watch all the trailers, t.v. spots, anything marketing related you'll notice it presents this gritty, dark, "In a World" type of feeling. Well you can imagine my shock when the movie turned out to be a big joke fest full of one-liners and pointless banter (with no character development at all for anyone). That way of marketing grew even larger when IM3 came out, they did their best to sell that movie as the "Dark Knight Rises" of IM, and I'm sorry but that movie was anything but TDKR. They took the one thing I didn't like about Avengers (pointless comedy) and doubled it. That kid sidekick should have had a shirt on that said "Target Demographic" and don't get me started on the so-called "Mandarin" (Ben Kingsley would have been the perfect villain too....)
Then out of nowhere, just when I was giving up on Marvel, out comes The Winter Soldier....OMG, FINALLY A FILM THAT KNOWS WHEN TO BE SERIOUS!!!! I was so happy to finally see a Marvel film I've been waiting for, one that doesn't fell the need to crack jokes all the time and gave every actor the character development that has been lacking from any Marvel film since Capt 1.
The only good thing I can say about GotG (since I haven't seen it) is that all the marketing has shown that this movie is a full-on comedy, instead of misguiding the audience into thinking it's some dark, meaningful film. Also, I'll be curious to see how GotG ties into Avengers 2. So far, in my opinion they haven't done much to tie things together for Phase 2, all the other films except for a bit in TWS have been presented more as stand alone films. Personally, if Thanos is really going to be a threat to anyone, he needs to make a presence throughout the series like Darth Vader for example, he was always there presenting a threat to Luke and the gang, he wasn't just stuck in some end credit scene that required homework for the general audience to figure out who he is.
That's just my 2 cents anyway
P.S. I don't know about the rest of you but I feel bad for Kick-...I mean Quicksilver in Age of Ultron. He's got some big shoes to fill after seeing the same character portrayed (brilliantly, in my opinion) in Days of Future Past...