If the Warriors win -- and it's the obviously safer bet that they will -- they'll go down as one of the best teams in history, record-wise, yet have one of the more unlikely, underdog-type MVPs ever in Curry. If the Cavs win, it will be seen as an all-time epic feat by Lebron. Either way, I think it will be pretty memorable. It's already a match-up between one of the best teams and one of the worst teams -- again, record-wise -- in NBA Finals history, and it has been more competitive to this point than many may have predicted
I don't consider it a "no win" situation for the Warriors, b/c duh, winning the Finals is winning the Finals, but also b/c even though the Cavs aren't great record-wise, they are led by possibly the GOAT putting in a Herculean effort. Team vs team, the Cavs are David to the Warriors' Goliath. Curry vs Lebron? MVP be dadgum sassafras shucks derned to heck, Lebron is Goliath and Curry is David.
I don't think it will be a negative reflection on Lebron unless he is set up for one more feat of greatness to seal the upset... and comes up short. I heard Mike & Mike talking before the Finals started about how if the Cavs were swept or lost in 5, Lebron will be criticized for not doing enough, and if the Cavs lose in 7, he'll be criticized for having one winner-takes-all game and not getting it done. They joked that other than winning, losing in 6 was the only thing that would be acceptable. Not fair, but since when has playing Lebron ever been fair to the other guy? He can take it.