Im almost sure some people are using exploits online.

[TLC]

It is very common for me to lose 1 or 2 tanks a game to flamerthrower ambushes, which is fair enough, but often the flamer soldier is still invisible and untargetable even when he is shooting, so when my tank could shoot them in time they die because the man takes about 10secs to appear. I thought all units were revealed when they opened fire but apparently not flamers.