Yi is seriously a joke right now (for my ELO)
TL;DR: BASICALLY YOUR BORING OLD QQ THREAD, DOWNVOTE AND IGNORE.
I'm a low ELO player, so obviously my complaints are going to be invalid when taken to higher ELO games. Here are a few complaints that I have about Yi... This is low ELO we're talking about, so obviously we're going to have shitty team comps and little CC. Typical low ELO stuff.
Also going to put out there that I think it's pretty stupid the game's balance revolves around Plat+. Sure, the argument is "well why should we balance for people who don't know how to play properly", but the people who don't know how to play properly are the vast majority of players.
-Yi sticks to targets way too hard when no CC is present. His ult gives him some pretty bullshit movement speed, and nobody from a tank to a carry has a chance of getting out alive.
-His damage is over the top, even when he's not fed. Seriously, I don't see why he gets so much damage.
-His Q allows him to negate a shit ton of CC and damage. Seriously, it gives a window for his enemies to completely waste their CC on absolutely nothing.
-His lifesteal... I generally have a complaint about lifesteal on all high-damage AD champions because it's kind of stupid. The lifesteal is usually only a problem late game or if Yi is fed, though, and games don't get to late game often anymore.
-His W... I just think it's ridiculous. A good knockup will do the trick, but once again, low ELO players don't always have that. The fact that he has two abilities to negate damage makes it even worse.
-The items he builds. Ugh, I can't even blame the champion for this, but the items are so damn frustrating.
I probably have more that I could think of if I wasn't so tired.