Doom is a fast-paced, iconic first-person shooter with a rich lore and diverse gameplay modes, while Alien Swarm emphasizes cooperative gameplay and strategy with a focus on team dynamics and class roles.
Alien Swarm
Pros:
Cooperative multiplayer experience
Strategic gameplay with team coordination
Variety of classes and roles to choose from
Free-to-play model makes it accessible
Engaging missions and objectives
Cons:
Limited single-player content
Can become chaotic with too many players
Less emphasis on story compared to Doom
Doom (Series)
Pros:
Iconic first-person shooter gameplay
Diverse weaponry and power-ups
Rich lore and story progression
Multiple game modes including single-player and multiplayer