Hello
So, I wanted to write a nice introduction here about how Multiplayer gaming sucks nowadays, good shooters (i.e. Quake) are dead, CS is the only popular FPS at the moment, yaddayaddayadda, but you all know this already, so I'll get straight to my idea/suggestion. What I basically propose is, that someone makes a Quake gamemode that mimicks the multiplayer part of the 1998(I think?) Playstation 1 game Future Cop. The mode I'm talking about is called Precinct Assault in the original game. Someone please do this, because it's awesome.

Wtf is it about?
See this vid for a basic idea, takes about 20 minutes, the guy explaining it does an okay job I think: https://www.youtube.com/watch?v=-ny4mp_ZVQw (gameplay starts at 6:15. There's an explanation from 1:30 to 5:30, which I find very good and is probably better than the huge wall of text below)

So, if you watched the vid, you will have realized, it's kind of like a duel mode for Dota, in the sense that you need to get your units into the enemy base to win and that there are towers/turrets that shoot at things. Well yeah, it is like that, except better in any way, because it doesn't have all the bullshit like champions, leveling, builds and all the crap that's in DotA/LoL.
Instead, the depth arises from items, turrets and other stuff on the map, and a simple (in concept) resource system, just like Quake. That's the best thing about it, all the ideas are very straight forward while still allowing for huge amount of depth, which is what we should look out for IMO. A Quake style adaption would basically lay all these new concepts with a completely new winning condition over the normal duel gamemode that we arleady know.

Here is how I would imagine the mode to work in a Quake adaption (a lot of this is basically explained in the video):
First off you spawn inside your base with a weapon like the MG or so. Then you move out of your base onto the map where other weapons, armor, health and all stuff like that is located. These things will respawn after a certain amount of time, and if you want, time them. Like normal Quake so far.
But when moving out, you also see a turret on the map that you can claim. You do, and now you have a turret that will shoot at enemy units. Yay. You go and claim some more turrets and get a point every time you do so. The enemy has also got himself some turrets which open fire on you, you destroy some of those and hey, you get points for that as well. Not only that, but the turrets you destroy respawn after a certain amount of time as neutral, you claim them which gives you points again. If you destroy multiple turrets in a row, you can time their respawn and setup a little "turret claiming cycle" similar to how people are cycling armors in QL. If you see the enemy destroying your turrets you can time those as well and be there when they respawn, so you get the points, and not him. If he wants the points, he'll need to destroy them again, which costs him time and ammo. Good movement is rewarded, because you need to be everywhere at the same time, and the maps aren't small by any means (as can be seen in the vid).
Turrets, points. Simple idea, hard to execute, because there are also Armors and MHs spawning and the other player is creeping around somewhere and will happily try to shoot you, since fragging players gets you points as well. These points are taken from the enemies points pool, so if you're a combat beast, just ignore the turrets entirely and focus on stack+fragging.

What are points actually for?
You need points to spawn units from your base and to claim outposts. Outposts are useful, because they have respawning turrets which automatically belong to you (not sure if they give the enemy points when destroyed). If you want, you can also spawn units from these outposts.

What are these units?
There are tanks and choppers. To talk in DotA terms, tanks are your creeps, i.e. they will move towards the enemy base along predefined route. But unlike DotA, there isn't just a constant stream of them moving towards the enemy base. Instead you need to spawn them from your base for points at the right moment. Choppers are spawned just like tanks, but they are defensive units and will shoot at anything in range. You also have some base turrets.

GETTING A TANK INTO THE ENEMY BASE IS THE WINNING CONDITION. These things are made out of paper, so you might need to walk before them and destroy anything in your path, especially the enemy player might be able to just plow through them. Tanks will claim neutral turrets for you (=points) and shoot at anything they meet on their way (=even more points). Depending on the map, there might be multiple routes the tanks will follow.

So:
Spawn, get weapons and stack, claim neutral turrets, shoot enemy turrets, time and reclaim freshly spawned turrets, frag the opponent, grab an outpost when you have enough points, defend the health/armor pickups, wear the enemy down, don't let him get turrets, get into your base and spawn tanks, clear the road for them, get a tank into the enemy base, and win.

I think this would be really cool.