Are any game modes locked behind DLC?

Solution 1:

Yep, nowadays basic game is pretty much useless in terms of playing multiplayer. Maps are tied to modes, by the way. Of course you can always play in servers using stock, but the selection is quite reduced. That's why EA has given stock BF3 for free or almost free several times. Most servers rotate using some of the maps from DLC's, so you can get kicked because lacking such DLC. The server description always states the required DLC however. Here are some specifics.

Basic Game

• Conquest
• Rush
• Team Deathmatch
• Squad Deathmatch
• Squad Rush
• Co-op

Back to Karkand

• Conquest Assault

Close Quarters

• Conquest Domination
• Gun Master
• Team Deathmatch Close Quarters

Aftermath

• Scavenger
• Gun Master

Armored Kill

• Tank Superiority

End Game

• Capture the Flag
• Air Superiority