One of the reasons for this is that you already experienced a lot of games and there are less of those "first" experiences. Another reason is that AAA and AA has been very same-y for a while (I almost wrote 'trash', but not really, it's pretty cool how far technology has come). AAA doesn't try anything new, AA tries to be AAA. I tend to go back to older games I'm not familiar with and I follow the indie market, there are pretty cool niche games out there which sometimes bring back the spark of that "first-experience" feeling.