I'm going to give you fights I have seen on Vine and out of the Vine that are greatest mismatches. Now if someone is using weaker characters vs stronger characters but weaker characters are super smart and have prep time then that isn't a mismatch. I'm also not using fight that I have seen only once (Beyonder vs Flash WTF!!!) but fights you can see more often. If some fight I mentioned is not on Vine that just means that I saw them on Youtube (or somewhere else). And If a character can give a good fight against his foe but can't beat him is also a mismatch. You can ask any question you want about these. Then give me some mismatches you saw that are not mentioned here:
- Quickesilver vs Flash WTF!!!?
- Batman (no prep) vs Iron-man WTF!!!!?
- Iron-man vs Green Lantern WTF!!!?
- Silver Surfer vs White Lanter.
- Superman vs Thanos WTF!!!!?
- Captain Marvel vs Wonder Woman WTF!!!!!?
- Deadpool vs Nightwing.
- Iron-man vs Cyborg.
- World BREAKER vs Rune King WTF!!!?
- Hulk vs Hulkbuster.
These are just a few. I can edit more of them later. What do you see as a mismatch (it doesn't have to be Marvel vs DC).