User blog comment:M.Davidz/Need your help for Shen !/@comment-25003900-20141114150148

Another reason Shen isn't as favored in the meta, this is in addition to the things mentioned below, is that his entire focus is a super tank that can pop around the map and gank, that's great and all, but more or less EVERY top laner worth their weight in salt currently takes Teleport. They all do what Shen can do, but in sacrificing the shield provided to another teammate they have their own ultimates still active for use when they get down into that fight. In addition his clear speeds in a fast clear ganking meta are just piss poor by comparison to just about every other champion.

Maokai still has his AoE damage reduction and a damage pop for the end of that, Mundo has super health regeneration, Rumble has the zoning dot burn, you get the point.

As for your suggested changes I don't know for sure that he really needs them to be honest, he's a perfectly acceptable champion pick, he's just outclassed by other champions in the current meta. Like Mordekaiser, or Cho'Gath are currently. He still performs well in the proper situations, he's just not as globally useful as champions like Maokai.