Keeping an incorrect opinion is fine, but I guess since I responded with a GIF and Ryker had to come in belligerently, I'll clarify.
Mr. Game and Watch is a pretty solid character overall with some pretty okay strengths. The general consensus has been for a long time that he is bad more likely than it has been that he has been good. He's a character that has apparently warranted buffs in just about every iteration he's continued in at every release date, so evidence seems to support this opinion.
As for Game and Watch players that see "great success", you've got a whopping total of... one, in Dakpo (as a solo-main and the only one to win a tournament with Solo Game and Watch.). Oracle is a high level Game and Watch player, but at this point is probably a lot more notable for his Lucas and Eli who is multifaceted, but is also loads more notable for his Donkey Kong. A step down from that, you have myself, Nahpro (Nap), Calvo, darkm3troid, Meiling (and probably more) who place pretty well , but generally inside of the top-8 but outside of the top-3 in our respective areas. His matchup spread is not very good (with maybe no winning matchups around the top level of the metagame, but a fair amount of close ones) and he has a fair amount of problems that are only further emphasized with the strengths of other characters.
It takes a lot of work to be good with this character as with just about any character in the game, so yes, people are going to take offense when you offer your opinion.