I sort of agree with you pipboy, but it's not like the unlockables are crucial for keeping up, a good medic is still a good medic and it'll be easy as pie to unlock the first two.
The unlockables' pros and cons are fairly balanced too: Blutsauger gives you a little health, but you can't kill squat with it (no crits! >_<), the Critzkrieg makes your target do crrrraazy damage but you f*cked if the other team come gunning at you with full force (no invul). The only thing i could think is a little OP is the UBERSAW which doesn't really seem to have that much of a trade-off (slower attack rate, think it's the same per hit damage as my bonesaw <3 ), and true, 10.000.000 healpoints is an insane grind, only for career medics.
So in conclusion: I'm a little torn in this matter, I don't like the momorpuguh-idea of the unlockables, but I can't help feel excited for the day that saw will finally be mine

I think I'd prefer it to just let the unlockables free for all, with more considerable pro vs cons, so you really had to think carefully while customizing your character, instead of grindgrindgrind until everyone is as overpowered like me.