I think yoshi has been buffed, sure melee yoshi had ALOT of things I liked so here's a list of what was nerfed and buffed =D well in my opinion.
Nerfs....
Yoshi's eggs, as a weapon anyway. Hitstun alot less (as with every move i brawl), range seems to be less, can't drop them below the level for a sexy stage spike anymore, or behind yoshi or at his feet to be used as a "shield" since his shield wasn't the greatest.
Nerfs...
Dsmash's knockback
Fsmash's knockback, leanback, ram forward range, and i think it's slower now so slightly nerfed in everyway.
Fair's usefulness, as an approach.
Dtilt's gimping potential
Ftilt's juggling ability (fox's and falco's I could sometimes hit 4 time with this before they could get away)
Utilt's priority I think, this just seemed to beat out every aerial attempted.
Usmash's priority, since from what I'm told yoshi's head was invincible.
Weight, people would always be like. C'mon die already, people never make it to 160% vs ___ (place top/high teir character's name here)
Cheap kills, Dtilt--> dair kill starting at 0% was mega hilarious
Neutral B range.
DownB's combo breaker for a WTF how was i killed type deal (mostly because there are no combos to break anymore)
Buffs...
Bair, everyone knows this now.
Dsmash range.
Usmash's usefullness
Ftilt's awesome range.
Jab, just in general I love this move.
Grab...I actually grab now?
Running grab...yoshi doesn't trip and stumble like an idiot anymore =D
Pivot grab...SOOOOO awesome.
Uair, this thing kills now and easily.
Recovery is SOOOO good now, used to be that after i lost my double jump I'd hope they'd jump out for an unnecessary hit and I'd Fair them, but now I have an option to survive.
Eggroll, finally priority.
DownB, they get knocked up into it? are they trying to make yoshi broken? =P
dtilt range
edgeguarding...sure no djc makes you more predictable but now and edgeguarding monster
Unsweetspotted Fair to rising Fair spike, not a real buff i just think it's awesome when you pull it off
I think that's it, man I was bored if I actually put all that.