Welll bhudd and dan are gud....but yeah it consists 3 star useless cards
well la jhunta,junkz,montana's and ghiest contain very good 3 star cards....i dont know about other clans....and yes nightmares also
As derMagus said, there are some useable cards at lvl 3, amelia being quite playable in my view, similar to a 9/5 at lvl 3 it's more than ok even if against soa can lose.
on the other hand, there are some clans in which it's maintained on purpose a weak spot. for example the lvl 3 pussycats or the lvl 3 all stars beacuse they already have many highly useable cards at high lvl and at lvl 2.