Older gamers are not as easily impressed.
I have played so many shooters over the years that something has to be significantly different to get my attention. Half-Life and Half-Life 2 were both radically departures from the industry norms. I just don't see that same leap forward in gameplay anymore. A lot of games are playing it safe. Syndicate to me tried something different and that didn't sell at all. So maybe games aren't really being made for people like me anymore. I still find games a lot of fun most of the time, but I can't remember the last time my jaw dropped.
The last time I had an experience with gaming that really felt like it meant something was playing Journey about 9 months ago. I bought a PS3 with Last of Us and GTA V, so I could play online with some buddies and play some PS exclusives I never got to try (I play my games on PC).
I was in tears at the end of the game, and I did not really understand why. It illicited an almost child-like emotional response in me, the kind of response I remember from playing through Final Fantasy VII for the first time, or when I finally found every single secret level in Super Mario World.