Don't think many here see Vlaar as top 6 quality, but he has shown to be very good for a team battling relegation and definitely much better than Clark and Baker.
then again i do think currently Vlaar is better than Vermaelen, Toure, Skrtel, Dawson, Evans, Ferdinand, Jones, Smalling and Demichelis to name a few at top 6 or 7 clubs
Then I guess these teams will be offering us great sums of money in the summer for Vlaar. I bet lambert can't wait to add to his transfer kitty.