His ult doesn't seem to be affected by spell shields (not to be confused with magic/black shields), and he has an annoying E ability. Annoying, but not as retarded a champion as some others.
If you spellshield the ultimate it doesn't latch onto you (but you can pick it back up when the spellshield drops).
Don't play Yi.
But seriously, yi is what is considered a "noob champ", he's easy to play, deals lots of damage and is hard to counter unless you have lots of practice against him.
It's also best to start out playing with decent friends, who won't rage at you, and will give you tips in live situations. I'm free if you wanna play, just PM me
play Yi and Annie. They are easy and fun to play, deal lots of damage and such.
actually, learn to lasthit creeps. it's an important thing that you need to learn first.