Pretty much the title. I think they would because of huge they are. The small ones like velociraptors would tear rightthrough slashing and giving fatal wounds.
There are tons of great weapons, but they are useless if you don't know where your enemy is. So I'd say, as a starting point, reliable intelligence is probably the most important thing you can have.
I guess a biological weapon would be pretty devestating, but in the future i say anti-matter technology paves the way
with that, absolute zero temps is the closest thing to an anti-matter power, since it makes atoms stop moving, making the object fall apart into nothingness.
Well trained squad armed mostly with assault rifles supported by attack helicopters. At least that is the perfect combination for today. The perfect weapon really was the A-bomb, powerful enough to destroy the will to fight. But, a good political mind and a brilliant speaking ability normally works best.