Alpha-nerding, natch.
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Regarding Thor: I actually enjoyed the first one more than I expected to, and actually liked it better than the first Iron Man (I liked IM2 better than IM as well, that's just how I'm wired).
As for Black Widow, I thought she was a "fun" character, if not exactly essential.
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Regarding Spider-man or Wolverine being in Avengers: currently can't happen since those licenses are with other studios, unless the studios make a deal for some reason (I consider it unlikely, but nothing's impossible).
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And finally, if you haven't seen it, How Thor Should Have Ended: