I also check Gamezebo's reviews but games are such a personal thing that everyone has their own preferences as to themes, gameplay, etc. I also like to buy games that are challenging BUT I also buy games that are easy. I play whatever I feel like depending on my mood (sometimes I just want easy seek & find).
I pretty much download every demo of a new HOG that comes out and know within a matter of mins whether it's a keeper, a maybe or a no.
Sometimes games surprise me too. I wasn't interested in the theme of the Day Dream series at all (weddings don't interest me) but I loved the series. Go figure!
Having said all that, I buy almost every HOG that comes out.