It's harder to find fighting games that aren't fun to watch than the other way around. Virtua Fighter can be boring if you're not into fighters, but that's about it. I recommend watching whatever you want.
As for players, I can't think of many top players that aren't likable. Floe can be whiny, but I like him enough. Marn has at least been trying to clean up his act. And I like FChamp dammit!
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I may laugh at my own jokes, but I don't dare laugh at SuperNiceDog!