http://www.youtube.com/watch?v=-a0XB-LZwI0

Seems legit

Nevermind the Black Shield or anything.

Nevermind the CC came prior to Meditate.

Wow... it's just so sad.

Oh look... all the CC was used prior to Meditate.

But obviously he's OP... since y'know, it's his tankiness prior to Meditate that kept him alive, which allowed him to Meditate and become the ultimate tank.

I'm gonna agree with the two other posts that didn't have youtard posts. If you want to kill a Yi force the meditate THE CC not CC then let him meditate. Come on now a 23 second CD on meditate if he doesn't get a kill. Look at all the champs in those videos. So much enemy team CC yet it was all executed by 600 elo players. Try that out in high elo and it will be a different story...

Things I saw and loved in those videos:
-Two Morganas massively missing binding ( the one that threw it toward the wraiths when yi was running straight to her was my fav)
-Vlad auto-attacking under tower, using low level pool for damage.
-Oblivious Caitlyn notices Janna is being attacked like 15 min later.
-Yi providing 0 help at teamfight other than cleanup.

And from this thread, some guy complaining about a skill that his champ has a tool to interrupt, that's like coming and complaining you ate nunu's ult to the face while playing Soraka.

1) use any cc to stop meditate. everything beside slows and snares works.
2)if by any chance u dont have any cc(lets say u used them against some1 else) use ignite/grievous wounds on him.
3) if non of above is available (for real?) just stop focusing him.its simple.yi cant deal any dmg when meditating, so just focus some1 else.

only when he kills
lol what? since when yi has passive heal?because only heal i know about is easy to interrupt skill that force him to stay in place and prevent from doing any dmg
move your cursor in direction opposed to enemy attacking you, then click,or use dash/blink - many champion has something like this or they picked flash
if u are ranged or mage u generally want to stay away from melee champions, if u are melee and someone has higher dmg than u u want to back off to. if u could ignore jungler's presence then this jungler is bad. If u want for junglers to generally be ignorable then wahts the point for them to even be there?
shen, malphite, mundo, nautilus- they are typical tanks. shiv, nunu, heacrim usualy go tanky too. Also u dont "have to" treat junglers as tanks. If he is going dps then treat him as dps.
he is NOT more resilient than any tank. in fact he is melee champion with low hp and only ability that lets him mitigate some dmg force him to stop attacking, stay in place and pray for enemy team dont use any cc to stop it and blow him up.
name single champion who posesses ability similar to zileans bomb. or shen's ulti. or mao sapling/ulti. or gailo shield.You want to every champions have similar abilities?
Also to answer your qestion - Dr Mundo and Singed bith has high boost to hp regen.also volibear. and non of them have to stay still to use it.
ramus and leona both have high boost to mr and armor. againt, they dont have to stay still to use it.
he can be jungler or ap carry. if u go ad meditate will heal u for about 800 over 5 sec- less than half of his max hp, and only if u dont cc him. also its stops him from attacking->stops all his dmg->make him useless.
if he is ap then hi has 1 skill to deal dmg. Now meditate sure heaks him a lot, but still u CAN stop it easly.Also, just as you said yourself - he has to sit still. so just stop focusing him and and kill rest of his team
Also meditate last 5 sec - if not stopped. this is nowhere near "endless"
if u initiating with yi u are idiot. Yi should never, EVER initiate.

omg if only there was a cheap item you could buy that would apply Grievous wounds to your target, oh wait there is, learn your items and know how to counter build

Ignite, stun, dance, pull, knock up, silence too I think. He has godly AP Ratios for a reason, But you have to realize at the same time that mediate has a 35 second cooldown. Thats ****ing insane for a normal ability and it only goes down through killing someone with ult or cooldown reduction. And more important issues are why doesnt Teemo have more skins and can we QQ more?

Anarchy. Dude. Use one CC, save just ONE silence or ANYTHING that can interrupt his meditate just for him. Boom he's lost it the moment you stun him. If he's AP he only has ONE way to damage you, Alpha Strike, if he doesn't kill someone, well then he's out of damage for the CD. If he tries to meditate, CC him. If your team has 0 CC you're doing it wrong. Its not hard to ignite him to somewhat reduce the heal, or to just stun/silence/knockup to cut it short. If your champ doesn't have any CC to interrupt with, get help from someone who does or lane switch. In team fights, just focus him for a second if you hate him that much, its pretty easy to nuke a glass cannon down before they can even think. OR if he's already used his Q, ignore him. Due to being AP his Auto attacks are mainly meaningless, so its quite easy to just ignore him if his Alpha Strike is down, he won't be doing much with his auto attacks if he's AP. He's a gimmick champion like that.

TL;DR AP Yi is a one trick pony, he Alpha Strikes, and then heals. Thats about it if no-one dies to the alpha strike.

I dont know... i dont think anyone intended yi to be able to regenerate under enemy towers dat early into the game.