You're just playing the wrong games. It's the same as it's always been, some games have incredible sound design, and some don't.
IMDN is probably the best sound package I've heard on a modern Stern. It's outstanding.
TNA is also fantastic.
MET is pretty great.
I played Wonka the other day and couldn't stand apparenty random slot machine noises. Nice shooter but they totally blew it with the sound integration on that game.
I only buy games where the whole package appeals to me (shots, rules, art, sound) since I have limited room.
But I don't think you can make a generic statement that modern games are lacking. Plus it's more challenging now vs. the 80's and 90's because there are less technical limitations. Pretty easy to produce a focused sound package when you can only play 2 sounds at one time. 
Leesburg, VA
