I’m just towards the end of playing the original Deus Ex at the moment and have now seen how stuff like gas grenades could work - might even be a worthy replacement for the panzer - certainly fairer. Things are starting to get interesting again
Res Evil 4, Doom 3, then news of RtCW2 - life is sweet 
Rate of Fire, Hitbox madness (prone) and XP along with maps that could easily have been three on an original RtCW server make the difference. In RtCW things were much tighter because everything was limited - it’s true that you had to really think about what you were going to do next because chances were if you got it wrong then you ended up dead along with some of your teammates most likely.
What really killed RtCW imho was when spawn timers were released and considered legit - because of the smaller map sizes, it meant that once one person on your team had given out the main spawn timings ppl could camp out - saw this alot and was every bit as annoying as /kill.
All I ask is that the class based cooperative system is seen as a gametype option in other mp games - having said all that, I hear that you can download the original Tribes for free now as there’s a new release in the works 