I wouldn't say I'm getting burnt out. However I can somewhat understand the sentiment and I might use the word disillusioned. Everything post Avengers to this point is just starting to feel really lazy and watered down. This is coming from someone who hated Iron Man 3 though, so take this with a grain of salt if you actually enjoyed that as a follow up to Avengers.
Sure I am intrigued for Thor 2 with Alan Taylor (Game of Thrones) on board (didn't particularly love the first one), and I did like the first Cap so I have no reason to suspect the second one won't be half decent. And as with most, I'm also pretty interested to see how they pull off GotG. That said, it really wouldn't shock me if they were all junk unfortunately.
And I also don't expect any of them will have any real impact on Avengers 2 either, which kind of defeats the purpose of all these supposed well-laid plans. Marvel is taking the easy route; make a bunch of stand alones, then just tranfix everyone in one giant mega movie. Will it work again? Maybe. I'd rather they build on the universes they've created, and have it be a serial mini-series so to speak. They brand themselves as such, but are continually lacking the substance to support that image. And I get why; it would be waaaay too complicated for them to have all of their screenwriters and directors in sync on that level. Except it really wouldn't be. But whatever.
What *should* have happened is this. Iron Man 3 ends with Tony Stark blasting up into space to see what else is out there after shattering a bunch of worlds down here. Pym should have been introduced in that film as well, and IM3 should have been followed up by Ant-Man, and the trouble Pym gets into playing around with AI with Stark gone up in space (cue the GotG cameo) and Ultron is created. Thor and Cap have their standalone stories but during which times the "growing" of Ultron is referenced or cut to. In Avengers 2, Pym joins the team alongside a few other newbies (Wasp, Quicksilver, Scarlet Witch), they defeat Ultron and just when they think the coast is clear Thanos arrives (to follow up on the end of GotG) and starts to fuck reign down on earth; cue Avengers 3 and the need to recruit Dr. Strange, Black Panther, etc.
Instead we get a bunch of pointless stories that aren't even adapted properly from the comics instead. Now again, it's not to say they can't end up being good on an individual basis, it just totally has killed my buzz for what I thought they were trying to do. I am much more stoked for Days of Future Past than I am for ANY of the upcoming Marvel films. And that pains me considering where we where a year and a half ago. Who knows after Thor 2 things could change for me, maybe I'm still just really sore after that absolute fuckin disaster of IM 3. Fuck me I really wish I didn't hate that film so much. It's coming out shortly on blu, maybe another watch or two if I can sit through it will lessen my hatred. We'll see.