Well I don't know where you've been looking, but in my experience, the first 2 Deicide albums, especially Legion, get plenty of positive receptions. From people with just a passing interest in death metal all the way to elitists. It's ranked in many "top death metal" album lists. Later Deicide is pretty bad, though.
As for Cannibal Corpse, I've never been a fan. I find them to be extremely boring and pedestrian for a death metal band. There are hundreds of death metal albums better than CC's best, so I see no reason to listen to them.