I like this game, I've never played the original DOOM but this one is great fun. They really do succeed in making you feel like a bad ass. "I can help you!" smashes intercom and keeps killing demons! Not to mention the rock music, even if it does get a bit old hearing the same stuff over and over.
I usually just shoot the stun bomb and then kill them with the double barrel afterwards. Then I just kill the bullet sponges with the chainsaw or the BFG.