That is completely different from actually tolerating the core gameplay loop. Anyone can recognize that Half Life is choosing to open slowly and will eventually let me shoot shit.It is a great game, but in the first 15 minutes you're walking about in a science station. You can press a microwave and someones soup explodes. It's entire game loop during that time is "walk around", followed by some mixing up with "push a cart". If premise and setting hasn't hooked you, then Half-Life 1 and 2 should be as boring as they can be, cause their entire 15-30 minute intros relies on drawing you as a player in into their worlds without relying on any shooty bang bang.
World building is fine, tho on replays Half Life's brand of story telling is a drawback. But once you get to the core loop Half Life has solid ballistics, fun guns, allows for bunnyhopping, no ADS or weapon limits, a wide variety of enemy types n encounter designs.
Spec Ops once it gets to the actual meat of the game is clunky, plodding, n has all the shallow short comings that come from being a cover shooter.
Which yeah the game doesn't have much going for it in that department to take longer than 15 minutes with its gameplay to realize it's unremarkable.