In previous MW game, there was no need to eject, why eject, when it got the same effect of going down with a big boom (altough in Mechcommander, was safer to eject mech so you could salavage it before it loses weapon or make sure the pilot stay alive).
BUT in MW:LL, here's an exemple: AAAAA 14 PPC shot coming straight at me !!! eject eject eject !!! Hehehe Battle Armor rul....
The Pilot in the previous exemple was yet another poor roadkill, walking in small battle armor is no easy task when surrounded by 100t machines, so please, look at each side of the road before trying to cross it.
And by critted, I think he meant (went critical, where critical mean "going kaboom")
Although critical hit could be interesting (whats better than getting your nice 3t of AC20 ammo blown off right inside of your mech... and you forgot to take CASE...)