It also appears that the .308 based rounds (specifically the .243 & 7mm-0 are the ones that have extraction problems. It this a fair call?
My .223 had problems until I polished the chamber. Still have to keep it meticulously clean though. I think every caliber has had it's extraction problems with the possible exception of the rimmed cartridges. Have not heard of anyone having problems with a 45-70 or 30-30. My 30-30 will put your eye out every time!
These rifles are inexpensive shooters. If you have expectations of a tack driving big game unit for just over $200 bucks it's probably not going to happen. Some guys have tack driving NEF rifles. It's just a matter of chance as to whether you will get one. Sometimes they can be improved with some of the tricks you will find commonly talked about on this forum. Sometimes they can't be improved very much!
So, really, it's just a matter of your expectations. If you draw a 2 moa gun will you be happy? If the answer is yes, go ahead. Extractions problems are for the most part easily cured in these guns