I can hardly be insulting towards them, if I just admitted I skipped an entire year of school to play them with friends.
But yeah, neither is the most deep creation in the world. You have to admit that both share the sort of repetitiveness and straight-forward nature that alot of modern games are panned for, even if it was new at the time. Zerg rushes aren't news to many people. Doesn't even mean they are bad, that's not my intention at all... I'm just sort of acknowledging the fact they they share alot of the same gameplay elements that modern 'addictive' games have, in the same way that Doom and Wolfenstien share qualities with all modern FPS games. The 'moulds' are the same.
Edit; To build on what I was saying about 'grindy', since it's pretty relevant, I was talking about repetative games. In both Counterstrike and Starcraft, the only way you can really improve in 'skill' in either game is by memorising the level layouts, how you attain certain equipment, the best ways to win generally, all through repition... WoW, for instance, certainly shares more than a few of these qualities because of how memorising the "in-game knowlage" is just as important to winning the game as reaction times or team strategy...
Where a game epitomizes these elements it can even be considered a strength, like any of the Fallout games or Dwarf Fortress. Both games are things I'm sure more than a few people have pulled double-digit hour sessions on.
Nomatter how amazing and ingrossing the game is supposed to be, I've never heard of anyone addicted to Shadow of the Collosus. It lacks these repetive elements, for better or worse.