I don't know what it is, but I can't seem to use Croagunk properly this metagame. It worked for me fabulously before BW2, but I've been trying really hard this time and have been completely unsuccessful in using it. I believe the problem is the popularity of Sand making Hippopotas, one of Croagunk's best counters, so very popular, and for scaring Croagunk out when Drilbur or Sandshrew comes to play. This is a shame, since I really appreciate Croagunk's ability to completely counter Lileep and most Water-type Pokemon this metagame. I just don't know if that niche is enough when it's being forced out by Drilbur, Sandshrew, Hippopotas, Murkrow, Misdreavus (let's be honest, a well played Will-o-Wisp Misdreavus just wins)...to the point where I can't really use my old best team anymore =/.
What do you guys think? Do you think the metagame is friendly to Croagunk? I appreciate the discussion of possible other sets, but I want to hear your opinion's on Croagunk's placement in the current metagame. How effective is it really?