Quake Wars is one crazy game that is very fun and has many great play style choices.
Gameplay wise it is very straight forward and puts you into the action immediately. The classes are very interesting and getting upgrades in matches is both fun and rewarding. The game is objective based with one team attacking and one team defending, but the objectives are very fun. One needs the Strogg to get energy cells to a crashed ship in order to power it up to win the match but first you need to put down deployables, and destory a generator which is preventing the energy cells to be deployed.
Another instance pits the GDF against a "Data Brain" and the GDF need to steal the brain and get it to a data center and upload the information, but first they need to get a large vehicle called an MCP to a deploy zone so they can launch a Strogg shield destroyer that will allow the GDF to hack into a computer terminal which they then have to steal the Data Brain.
The classes are the same on each side with a few differences, like their names, some weapons fire faster or slower and are more powerful or less powerful.
Quake Wars maps are nicely sized and give adequate room for aircraft to fly through and all the different vehicles room to get people where they need to be.
But in order to to play this game you need to have fairly good reflexes as much of it is a twitch fest and is not about tactics much of the time. It is mostly about sabatoging deployables, sprinting so enemies have a hard time shooting till you're close enough to hit them, or just amassing your team and charging the enemy.
But a word to the wise don't play this game offline. It is both boring and the difficulty is waaaay to easy. You have to play this online or LAN to really get one of the best online shooter experiences in the past few years.