I know it's impossible, but if ever Bungie and Microsoft got paid a lot of money to release halo games on PS3, would Halo Reach be the biggest game on PS3?  Would PS3 fans embrace Halo?  Or sell less 1/3 of Xbox360?

It would do ok, but not great. Ps3 fans aren't fps fans. 

Well you have to remember that a big part of the disparity for FFXIII is that it never released in one region for 360 which made up a large amount of the PS3 sales. Therefore I think Halo Reach would do worse on PS3, but probably not all the way down to a third.

Best selling PS3 game says hello

lmao

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It would do half

call of duty is an entirely different beast than halo

A 'what if' scenario.

I'm sure PS3 fans would embrace Halo, it's a big franchise with strong reviews.

Would it be the best selling PS3 game? I doubt it.

This

You also have to consider the fact that the 360 version had exclusive advertising in the West.

I can't recall ever seeing a FFXIII TV advert that showed the PS3 logo in it, only XBox360.

The fanbase for the game is on 360, if it were released on PS3 it would only get a small fraction of the sales.