I used to be crazily addicted to RTS games and spent god knows how many hours playing C&C Red Alert and then Starcraft and then Age of Empires 2, but ever since then I've not found a single game of that genre that has grabbed me and it's such a big let down.
I so wanted to love Age of Mythology and then Age of Empires 3 but I just can't. The same goes for Tiberian Sun, Red Alert 2, C&C Generals and lately C&C 3...they are all just missing something as far as I'm concerned. A real biggie is that no matter how hard I tried, I couldn't even enjoy Warcraft 3. Others have come and gone like Empire Earth, Rise of Nations, DoW+addons, LOTR:ROTMK, Company of Heroes and so on and so forth, yet I still haven't found a single one that ignites my gaming passion like those 3 older games managed to do so successfully.
Come to think of it, the last games of any genre to really blow me away were Deus Ex, Baldur's Gate 2, Diablo 2 and Counterstrike. How sad...