Yeah, nice try. But I was in the beta too, and the only things this game has in common with CoD is the developer, and that it's an FPS.
And the game was never 32 players. It would have been unplayable. The reason it's 6v6 plus bots-- and really, this is the genius of it --is that they wanted players, the Titan Pilots, to feel special in-universe (By having them surrounded by 'ordinary' infantry) and make them feel completely badass (By making the infantry easy to mow down a squad at a time.) without making actual players take on these other roles.
The other aspect the bots represent is making it so players of any skill level can contribute; you don't have to be able to take out other pilots, you can go around and take out dozens of AI troops instead. It's not as efficient, but it still earns points and XP, and all the weapons have Grunt/Spectre killing challenges.
If there were more than 12 players, Titan combat would be a complete clusterfuck, or they'd have to limit access to the Titans. And who the hell would want to play if they don't get a 6-meter-tall walking death machine?
Again, this goes back to making the players feel special in-universe; They are Titan Pilots. They are Elite Badass Motherfuckers. The AI infantry can be heard saying stuff like "Hey, it's a pilot! About time!" or "Did you see that! That pilot jumped right on the back of that Titan!"
There's more nuance in the Titan cockpit entry sequence than there is in the entirety of any Call of Duty game, so why don't you just stick to telling kids on Xbox Live about how you fucked their mom, you ignorant fuckwit.