Either me or the highly paid professionals at our club are getting it wrong, but to me Lovren's new £100k/week contract borders on insanity. He's not even the best defender in the club, let alone one of the top defenders in the Premier league or the world, as his new salary would suggest.
Lovren always has a good attitude, but he is inconsistent, prone to poor decisions, often poorly positioned, and not very good at 1-on-1 situations. He loses more tackles than he wins (an anomaly among the top-6 team defenders). One of his two strengths is the aggressive defending where he aims to cut moves short from in front of the attackers, but if he misses those, there's a huge hole in the middle of our defense. He is also quite good in the air, but that's often undermined by his poor positioning, meaning that he is often not where he should be to make the challenge for the ball in the first place.
Just to elaborate the point, I thought Škrtel and Lovren were pretty much on a par with each other; yet one was ousted and the other is offered a king's ransom. Škrtel was part of the defense that leaked only 27 goals in 2008/09, and 28 the year before that and 35 the year after; we have not conceded less than 48 during Lovren's tenure. This comparison is of course completely unfair and arbitrary, and yet I don't think any team can win the Premier league with Lovren as a first-choice defender. I will be ecstatic if I'm proven wrong.
EDIT. Just to clarify: in my opinion our current horrid defensive record is not the sole fault of our defenders. We currently lack protective DM (Lucas is one, but very seldom played as such, and Henderson can also offer adequate protection even if he's naturally more box-to-box midfielder thanks to his relentless workrate / endless running, but his Achilles' heel may limit his contributions severely in the future as well). As has been pointed out by others, our current playing style (high line, attacking mentality) and the lack of covering DM exposes defenders time and time again in a very demanding manner. If we'd want to improve that, we'd need a world-class DM to replace Can as a starter.