I always look at the 'my plants sucked' complaints with a grain of salt... the experience of the grower makes a lot of difference in results... but I got the Nirvana WW too and am not too impressed so far... kind of lame. On the other hand their Papaya (a mango knockoff) is surprisingly killah. I got a little phenotypic variation but the pheno that I will be revegging fro a mom is FANTASTICALLY resiny, smells like fresh tropical fruit (not specifically papaya but who's counting), and has a very good combination of crazy top cola plus extensive development of branches at the lowest nodes.
Meh, you get what you pay for, and sometimes a little more!