Nick Fury’s cool, and everything, but there’s no way one old man can take on Batman…
Though, if he’s in his SHIELD-issue Flying Car, complete with the 30mm Gatling Gun (yikes!), it could get a little more interesting!
Bats usually doesn’t get to play with Military grade ‘toys’!

Vs. Avengers: they would treat this the same way they did Vs JLA. Which is to say without ANY consideration for the individuals he’s taking on. Don’t get me wwrong – Bats is one of my absolute favs, but come on people. That utility belt can only hold SO many other heroes’ “kryptonites” before it gets ridiculous.

Vs. Batman: this was my second choice, for reasons stated very well by Jeff.

Vs. Cobra: Marvel’s version of the cobra organization is FAAAAAAR more dastardly and well-run than the cartoon version that a lot of people automatically think of when they hear the words “cobra” and/or “GI Joe”. Still, I think that Snake Eyes is about as close to Batman as that universe gets and he can take on an entire cobra base himself, so I don’t need to see Bats do it again.

Vs. Conan: Could be veeeeery interesting. But. It wouldn’t be. They would almost certainly make this a ridiculously easy victory for Bats, even though, as jeff said it, Conan is his world’s “Batman” in a lot of ways. When Marvel did their Cap vs Conan years back, it was ridiculously easy for Conan to beat Cap, and the reverse would be the same if Bat took on Conana, I believe.

Vs. Decepticons: This could be interesting, but the coolest thing about transformers for me is seeing and hearing the transformation, not watching it in still-life on a panel. I could never get into the transformers comics for this very reason.

Vs. Wolverine: This would be the reverse of the Batman vs Captain America that was done in the 90s. They would make a perfunctory showing of how the two are “about equal” and then have something lame happen that would, of course, result in Wolverine being the winner. Because wolverine always wins. Always. Which is why I hate him. Or at least, I hate the way his writers DON’T do their job, which is to write cool/interesting stories.

Vs. WOnder Woman: As Wonder Woman is a part of the JLA, I consider this to have been done already, in spirit if not on paper. After all, if Batman can beat ALL of the JLA, then Wonder Woman alone would OBVIOUSLY not be a problem, right? *scoffs at the ridiculous nature of those story arcs*

Vs. X-Men: If Wolverine is a part of the team, then there’s no point in me going on. If he is NOT part of the lineup that Bats would be taking on, then there’s still almost no reason for me to go on, but I will for the sake of being thorough. The X portion of the Marvel U is a big, angst-filled teenage drama. It has some very powerful people in it, but for the most part, they are all so absorbed in their own “human problems” that they would not prove the least bit challenging for Batman, DC’s veritable god of planning/preparation.