Bad management/tactics can make even the very best look poor (and Skrtel ain't one of the very best). Ask any Chelsea fan what Terry looked liked playing for AVBHe was all over the place week in week out. Poor tactics which didn't suit the league and partnered by Sideshow Bob it was a recipe for disaster.
The simple fact is Skrtel's played in a defence that under Kenny had little trouble keeping clean sheets. Playing in a system that suited and with a partner who was decent Skrtel was alright (never brilliant but a hell of a lot better than we've ever seen from Lovren or Sakho).
Only comfortable playing in a deep line
Loses concentration
Only passes back and to Lovren
Doesn't cover his full back or partner
Poor positionally
Easily bullied
We continually blame the system but refuse to accept that the one constant in our defence throughout the past years of defensive mediocrity is part of the problem. His errors are not as visible - poor positioning, marking is harder to pick up than say Sakho misplacing a pass, or Toure scoring an own goal. This is how Skrtel gets by.
He was all over the place week in week out. Poor tactics which didn't suit the league and partnered by Sideshow Bob it was a recipe for disaster.
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