COD2 BRO is a good game. Yes, it is diff from the 360 ver -- considerably diff -- just look at the hardware the games run on to understand.
That being said, COD2 BRO is a great PS2 game. Unlike most COD games which feature 3 diff nationalities and their storylines, BRO focuses only on the US Big Red One regiment (forgive if I get my military terms wrong). It is more character driven than most COD games, reminding me of the story telling style found in "Brother In Arms: Road to Hill 30." The single player game is very satisfying. Many say the multiplayer is great as well, but I still prefer the MP in COD: Finest Hour (COD1 for consoles).
COD2 BRO is not a hobbled, cut down version of COD2 360, but a different game.
Like all COD games, it really captures the chaos of war in its single player mode, delivering on all the intensity that has made the series famous.
The "Enhanced" features are the same that were found in the original "Special Ed" version when the game was orig released, and includes: 1 diff skin for each team, and some extra "Making of" films not included in the basic edition.
COD2 on the 360 is a whole diff ball game, and is truely amazing, and exceeds the PS2 version by leaps and bounds, but for those who have yet to make the next gen jump (and that is a whole lot of folks), this game will be great.