I cannot stress enough how essential the Bolt Thrower is. If you're playing on Hardcore or Professional, it's the most important weapon in your inventory. Don't let the low damage full you. During exploration and quieter sections, using this thing will set you a fuck ton of ammunition. I'm seen some complaints from people reaching certain sections of the game and not having enough ammo to deal with the enemies. I'm guessing their playing on Hardcore and ignoring the Bolt Thrower. Get it, upgrade it, use it. You'll be surprised how useful it is. Also use you environment to you advantage. Don't destroy beartraps, use them to learn enemies in. If you do, they'll get caught, melee them, and it's a one hit kill. Lure them into tripwires also.
They're both great, but this is definitely better. Better gameplay, story, characters, more content, etc.