I don't think this is a stereotype of Yoshi, but rather a Stereotype of a person who only knows of their character only and doesn't know how he stacks against the rest of the roster. Anyone who is "New" says this about their character. Plenty of players do this and even those who main the Higher Tier characters (Excluding MetaKnight)
Even MK mains like to overblow their match-up numbers, I'd say. But I'll concede, it's not just a Yoshi thing.
Actually, Yoshi is one of the better damage at racking up damage. He's got plenty of multihit attacks, which can cancel out into various combos. Not to mention he has Grab Release stuff on half the characters, and his Dthrow can setup more Combos decently. He's also got a decent projectile which is good for anti-camping, approaches, anti-air, and harassment in general.
Yeah, I admitted above that I should have used the term "fairly decent" to describe his damage racking capabilities. Nevertheless, even with his good grab releases and such, he still lacks killing options to take advantage of that.
The other stuff is true to an extent. He also has one of the best grabs in the game, A good defencive game even with his craptastic shield, Devastating Grab Release Combos, Fast attacks, Ledge Spam, and against a great Yoshi, his Recovery is practically ingimpable.
"One of the best grabs in the game is a pretty gross overstatement, I must say. Neither his dash grab nor his standing grab are particularly effective, but they are both long. Chaingrab wise, you can do much better with stuff like D3, Falco, Pikachu or the Ice Climbers. Damage wise, Yoshi is pretty much in between Marth and Ike for throw damage. (Namely, not a whole lot). His attacks are fast enough, I'll give you that. His recovery with the second jump is pretty decent, but it's a constant worry to be hit out of the second jump, then you've got the vertical ascension of Donkey Kong with your egg toss.
His damage racking, Like I said, isn't actually a problem at all. Neither is his Range (He actually got pretty good range. In fact, his range is probably longer than about half the roster. His Recovery is severely underrated. Theoretically, Yoshi is practically impossible to gimp if he has his Double Jump, which 95% of the time, he does.
His range is average, I guess. It's not worse than some, for sure. It's probably my slight Ike bias here, I tend to look at anything that doesn't wield Ragnell as having bad range. Actually, Yoshi does lose out to the disjointed hitbox users, and some other ones as well. His recovery I discussed above.
It's hard to get my point across as well without myself being accused to being Biased, given that Yoshi has the negative reputation he has. I do accept that Yoshi will probably never reach the top spot, and some characters will always be better than him, but deserves alot more credit that people give him for
I'm perfectly familiar with negative reputations, mind you. Yoshi is deserving of better, but how much better is debatable. It's just that the hyper about Yoshi seems...undeserved.