Breed is not that bad. It has good graphics, average voice acting and a really fun enviroment.
First lets get all the negative things aside. The AI is OK, but frustrating in some moments. The enemy hide, shoot, run at you, but seems to lack common sense. I sniped a BREED, whose companion crouched and just stared. Anyway, the AI still provides some challenge in numbers.
The animations could have been more polished, but the game has a low spec so old pcs can play it. The physics too could have been better. There are floating guns on a tower, and once I fired a shoulder mounted rocket at a large tower, half of it blew up. Its like blowing up half of the empire state building with 1 rocket. Level scripts could have been better. SOmetimes you don't even know what to do.
Now we get to the positive things. The graphics are good, better than HALO. The vehcles are SO FUN to use. Tanks, dropships, fighters, jeeps, APCs. The numerouse vehicles can be interacted with. E.g on a dropship you can opn/close windows, use mounted weapons, drop the ramp....
The enviroment is also very interactive. Trees can be destroyed, use turrets from damaged tanks...
In all, a good 7. If they fix all the glitches, better AI, better sound, better animations, it would be what it was supposed to be.