First of all, there isn't really a "bad" or "good" when it coems to tamas. DO you love Nikatchis? then in my opinion that is the BEST character out there! Don't worry about average or good or bad. Just enjoy!
(oh, they are average if you consider them in "good" or "bad")
don't get cought up in the good and bad tama thing, learn to love the one you get! they are all the same and just because it is bad care dose'nt mean it isn't loveable!