To be fair, Corrin in Smash and Corrin in FE are two different things. The only useful point for his FE appearance is seeing how well he was represented with his moves. Otherwise, his usefulness in each game are unique. There's also the factor of why he was added to Smash, and that was for unique abilities/moves that others couldn't pull off. Nobody should need to play Fates to judge how he is in Smash bar "proper representation" only. The "too much FE DLC" is not a bad point, as I agree with that too. Even Push does. Sakurai even saw it as a small issue(his team convinced him otherwise). With limited DLC, any series getting more than one feels like a copout. That said, I like Corrin because he's a literal playable dragon, and that's in-universe too. Charizard is only a Dragon officially in his Mega form, and Bowser is technically a Turtle with dragon-like moves.
To be fair, it most of the time has professionally done information. But it is usually edited by major members with decent credit to their name and not random people. Like I said, I think the wiki has issues, as it's far from perfect, but the screw-ups are not that common.
That said, it's still a fact that many of the main wiki editors are backroom members and have more credit to their name. That's why I find it a bit more trustworthy than someone who's not a backroom member saying "lol this guy is bad". Again, I do not mean offense to Chandelure here, but he did give me no explanation and just a blind hate-based statement. How else can I react when I have nothing to work with but someone who has zero credit to their name? This is why many don't take my competitive knowledge seriously. I have very few, true, but it's not like I have credit to my name at all.