As someone that's been to round 100, I disagree. I used to have the same opinion before I went for it, trust me round 1-50 and 50-100 are completely different. As I said, constant ammo shortages force you to hit the box mid-round to get the wonder-weapon again, which can always be very dangerous if it's in a bad area. And you do HAVE to have the wonder-weapon at round 60+ as not even the Ray Gun will do a damn thing. Of course you can use the traps too if the map has them, like Verruckt and Der Riese where you basically depend solely on the traps to get through the higher rounds. Either way though, the rounds become painstakingly long, you lose concentration and silly mistakes happen.
People that haven't been to round 100 really can't comment on how easy or hard it is, from personal experience it's really not as easy as it seems.
On people not going for 100+ because they're on a console... stop making excuses the majority of world records in this game have been done on both PS3 and Xbox, a lot of them being 100+ rounds.
I wasn't making excuses, I heard if you keep a console on for a few days it will overheat etc. May be wrong though. But my kino strategy wouldn't change from 50-100 because I use traps. As for loosing concentration, I'd just have breaks when I got tired. I know that it would get tedious, but the gameplay itself would not get harder.