Resident Evil 6 X Left for Dead 2

[Combat Lobster]

What's wrong with crossovers? Aren't Nintendo, Nippon Ichi*, SNK and Konami as guilty to that anyway.

Unlike them,they don't do it an a daily basis.

Now i'll shall list the companies to the game crossover should be. excluding minor appearance

Nintendo:

[spoiler]
Smash Bros. Series
Fire Emblem X Shin Megami Tensei
Pokemon Conquest
[/spoiler]


SNK :

[spoiler]
SNK vs. Capcom
[/spoiler]

Konami:
[spoiler]
Konami Wai Wai World
New International Track & Field
DreamMix TV World Fighters
Ape Escape 3 (A Metal Gear-based minigame)
[/spoiler]

Not familiar with Nippon Ichi work so i can't say much about it.

Now lets look at Capcom:

[spoiler]
Marvel vs. Capcom
X-Men vs. Street Fighter
Marvel Super Heroes Vs Street Fighter
SNK vs. Capcom
SNK vs. Capcom: Match of the Millennium
Capcom vs. SNK: Millennium Fight 2000
Capcom vs. SNK 2: Mark of the Millennium
Tatsunoko vs. Capcom: Cross Generation of Heroes
Street Fighter X Tekken
SNK vs. Capcom: Card Fighters Clash
Namco × Capcom
Project X Zone
Cross Edge
Professor Layton vs. Ace Attorney
Megaman X Street Fighter
[/spoiler]

Capcom must be outsourcing all the work to fanfic writers.