Liverpool's defence is terrible, Agger or Skrtel are almost always injured when the other one isn't, Jamie Caraghter is the 2nd worst defender in the history of the Premier League (the 1st being Traore), he should be red carded in practically every game he plays in and I know of no player in history who has escaped more penalty calls then him.
And Liverpool haven't had good fullbacks in years.
And then you have Lucas as a holding midfield, oh dear oh dear.
Lucas is actually pretty good now that he's come into his own. Probably one of the reasons we finished 6th instead of 12th.
Carra is past it, I'll give that. But your analysis of him is completely wrong.

When he's on his game, he's one of the best. Our fullbacks aren't very good. Kelly and Flannagan are promising, Johnson is inconsistent, Konchesky is shit, and Aurellio is forever injured.
Skrtel was shit last season, but I don't think he missed a match this year. If Agger ever plays a full season I'll be amazed.
Hopefully we get Scott Dann and a decent left back.
EDIT: Yeah, Reina is pretty fuckin' amazing.