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I used to collect the Marvel Overpower CCG in its heyday. My friends and I were HUGE into it in high school.
Now, about a decade later, I've discovered my old collection in storage. It's pretty sizable, 4-5 long card boxes worth, plus a few binders of sleeved cards.
There a market for these anymore? I was surprised to find some of my other niche CCG cards to have value when I sold them on eBay a while back. Someone paid over 150 dollars for my small Aliens Versus Predator CCG collection last year. Amazing.

Anyone know if Marvel Overpower still has a niche market, or should I just recycle them?

I'd recommend trying to do like you did with your AvP cards. First check on eBay and see if anyone's selling them and then look at what completed sales are netting. Once you have some info then you can put up a trade ad or just try to sell them off on eBay.