It has to do with the system not scaling well at the ends.
And crits certainly don't help 1st level characters. Actually, with no confirmation roll, crits are even more of a danger to first level characters, statistically. If something comes running at you with a d12 damage die and a damage bonus, unless you start with 25+ hps, you just have to pray that they don't roll high.
Its one of the problems in Saga. At first level, fighting stormtroopers, if the combat goes on to the point that they get 20 shots off, they're statistically likely to drop at least one character unless its a soldier or a scout with a high Con modifier. Nat 20 + average damage of 13.5 = 27. Bang.
Of course, if they're *smart* stormtroopers they'll just autofire at you and auto-kill everyone who doesn't have cover or evasion.
Half damage even if they miss= 6 per stormtrooper (well, 6.75). 4 of them wipe half the classes out. 2 more will drop the soldiers too. And thats if they all *miss*.