Would like some comments on this build.
1st build is for balanced teams.
RUSH FM. Then get atmas ASAP. depending on opponents, get your banshees or warmogs. Change these two in order ONLY. ur dmg will be quite good with the first 3 hp items. This is time for a proper defensive item. Get an FON or a Thorn. Sunfire after this for more HP. Dont be afraid of madreds its only 2 percent of ur max hp after magic resist. This is Max Build. ALWAYS USE MEDITATE AFTER THEY FOCUS YOU.
2nd is ap tank build against magic teams using ap dmg where ur alpha can be used to dodge CC.
3rd is usual tank build against dps teams. Almost like first build but some might like to go ap against dps teams since zhonyas helps here a lot. Use zhonyas active when ur meditate is not lasting!!!

Tank Yi is an usual playstyle, but it is actually successful. Your opponents cannot ignore you since you have Wuju Style and Highlander will allow you to continue dishing out a lot of damage. Mobafire has not yet added in the 2 percent of maximum hp as damage so there is actually another 70 attack damage after all hp items are finalised.

Marks are armor pen to give you more bite

Seals are armor/level, giving you another 25 armor at level 18.

Glyphs are for more mana for longer lane lasting

Quints are flat health to increase early game advantage.

Ghost for reaching the teamfight fast. Also for chase/gank/run.

Teleport for defending towers and pushing towers like no tomorrow.(when your team does not need you)