If you consider a Usage Rate of around 5% and winrate around 40% weak, mind explaining why I am still waiting for a Mega Knight Buff since half a year?
Within the last 14 days MK had a 6% usage rate and a win rate of 38% in GCs. And within the last couple of other seasons these stats didnt really look any better, afaik he never went above a 40% winrate in Grand Challenges. The only trophy range where he is good is probably between 5.000 and 6.000 trophies where People also struggle against Hog Riders, Wizards and other Cards which are absolutely terrible in High Ladder and GCs.
Since its a Legendary overleveling shouldnt really be a Problem, so I dont really get why its such an big issue increasing any of its stats by a bit
Because Mega Knight isn't 40% winrate - he's at 4%-48% in 8+ Win GC games. So while a bit underused in top play, he's not bad. His use rates are strong in GCs (11%) / CCs (17%) overall and very popular on the ladder until you get to the very top highest ranks.