I follow three teams regulary; Southampton, Olympique Lyon and AC Milan. I nearly never miss a game from these teams.
I will try to put things in perspective; he is definitely better than Hooiveld and Fonte, so he is an improvment of a kind. He is also probably no worse than Yoshida, at least. I am a bit disappointed i guess because i expected someone really top notch. Lovren is good, but I know all of his flaws, so i can't be as excited as others. We are getting a good player, but also a flawed player. Physically, he is great; fast(for a CB), strong, agile. He is also very good at man marking and defending one-on-one situations. Those are his virtues. His main problems are of mental nature. He seems to be unable to remain concentarated and composed troughout the match, he has lapses in concentation and is known to make some wrong/hasty/rash decisions which can be very costly. If he could elimnate those mistakes from his game, he would really be class CB. This way he is just an average Prem defender. But hopefully he can still improve.
And Pochettino's way of playing will probably suit him, it seems he is more suited for an aggressive pressing game than conventional 'sitting deep and waiting' defence. That's probaby the reason they went for him.