I haven't played Rogue Spear much recently, but I did a lot about a year ago, and a few days about a month ago.
My views are as follows:
UT (or Q3, if you swing that way), Counter-strike, and Rogue Spear are all on a sliding scale of realism and action. UT has the maximum amount of actions of the three, but lowest realism. Rogue Spear has the highest realism but action is very slow at times. Counterstrike, IMHO, combines the best of both worlds: rather good realism in damage and weaponry, but still the ability to have the game somewhat action-packed. For those who prefer more of one or the other, UT or RS is more fun for them. In my opinion, all 3 are great games, and which one you should play only depends on what you want in a game.