I can only remember him for suspicious defending and great shots in Lazio.
Not saying he's the perfect player or anything, but overall, he was a good player for Lazio. And have a look at the market, man. Can you name any other left backs we should prioritize instead? Truth is that the only LB in our squad is Paolo De Ceglie, and that there's practically no one in the market besides Kolarov. Unless you think Peluso would be a good signing. Cissokho is signing for some other club now, and frankly, I don't rate him. I think getting Kolarov would make sense, as he has Serie-A experience, and I'm sure Conte would bring the best out of him.
However, I totally agree with prioritizing a CF first.