I've just seen this 50 Years Of The Avengers variant cover for Avengers #19, and I find it a little odd.
Considering the first issue of The Avengers was released in September of 1963, it seems strange to me that they would choose to include Captain America in the picture, as he obviously didn't join until #4, in March of 1964. I realise he's become a much more important member than The Hulk, but given that this is an anniversary of the first issue, I think it would have made more sense to include Hulk rather than Captain America.
It seems to actually be an homage to this panel from Avengers #4 where Captain America joins the team:
If we take it to be that this cover is celebrating the early anniversary of Avengers #4 for whatever reason, then I suppose it makes sense that Hank Pym is appearing as Giant Man. If it turns out to be that they're doing several covers depicting important early Avengers moments, then this cover will be almost fine.
A problem I have though is that Wasp isn't named on the cover, despite appearing in the main image, and the corner image(which was first used on the cover of Avengers #7). The names at the top are clearly an homage to Avengers #1, where she also wasn't named for some reason, but if they're willing to change two of the names, would it really be so hard to add another? Especially as she's a founding member, whilst Captain America is not. No idea why they've done this. Seems unfair to me.
Anyway, apart from the aforementioned flaws, and possible strange choices, I think it's a pretty nice cover. Anyone got any thoughts on it?