Well, it's not the question of overwhelming odds but of the player's ability to deal with them. Manage the crowd, move tactically, carefully use limited ammo, get the enemies to attack each other if possible etc. It's fun, IF DONE RIGHT.
DML basically gives you a melee weapon the use of which is limited to standing on one spot and swinging monotonously building rage that makes attack animation faster, and a gun, which needs ammo, which is very rare. There are several weapons of each type but swords are barely different and guns don't make much of a difference, since some maps have no ammo at all and some definitely don't have enough for the crowds they throw at you. So, the combat goes like this - you find a good spot and hold the attack button, making sure the character is facing the weakest or the most dangerous enemies.
The enemies include zombies and more zombies, zombie dogs that kill you in 2 seconds if you don't shoot them or whack them before they bite (hard to do if there's 10 of them), zombies that throw a net over you from a distance and make the character immobile (can't be dodged AFAIK) and shamans that don't need to come up to you, since they use ranged area spells. Now, I personally gave up on the game, when I was led into a courtyard featuring both the ranged immobilizing zombies and the ranged shamans, after finding next to no ammo. If I wanted I measure every single move/shot, I would've played Deadly Rooms of Death and actually enjoyed that.