I agree with you, more or less in part. In my opinion, The Avengers was a better movie than all the other Marvel films combined, so now I've lost a bit of interest in the individual sequels, more interested in Avengers 2 than the others. Maybe it's a bit too much.
I'm still interested for Iron Man 3 (Shane Black, Guy Pearce...), for Thor 2 I think I'll wait for the reviews to decide (if done well, it can be very good, if not...
) and for the Captain America I'll wait for the DVD (didn't love the first, not interested in the sequels).
I like the effort of building a Movie continuity between them, however, it's an admirable work.