Lol. so, I present to you... a short Yoshi presentation.
Just SOME (emphasis on SOME for those who are ignorant and/or don't read everything) good points:
Yoshi has...
1. Wavedash, AKA dragonic reverse (NOT crawl dash, and not Egg Toss Slide)
2. INFINITE jump, which he can use to INCREASE vertical height
3. SUPER jump, which is him making his Double Jump even higher.
4. Chaingrabs AND projectiles, which both seem very important in Brawl, like how speed was very important in Melee.
5. Many ATs, like ETS, Quick Pivot Grab, and more.
6. A Fair as a spike, and Dair also as a spike, although may be not as powerful as some spikes. But, the Dair is quick too, so I'd consider it good.
Yoshi doesn't have...
1. A fast dodge roll
2. Can't jump out of shield (i dont see this as a too important thing)
3. I don't know. I guess he doesn't really have both a very quick and very strong attack like some (I guess his Nair would count though)
4. Little lag after a grab. (quick pivot grab could help prevent this tho)
May be more on this later if people care to talk about Yoshi