Hmm, it's hard to say why there are so few people online, I've noticed the same thing too though. Out of all registered people, only a portion are going to be playing at any one time, most likely ~10%. Considering many of that 10% are worldwide and at different timezones, that can make a difference as well. Plus the game is still new, for some reason many people feel they have to play the campaign before going online and playing. I haven't even touched the campaign, lol, but my friend won't go out and play ranked until he beats the game (which he just did last night).
Maybe people are still doing that, or maybe they are getting rocked online because their specs aren't up to snuff, so they go back to their older games that are more playable.
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