Oh my god, this game is fucking amazing. I am having a blast working through all of the boxers in the game. I played a whole bunch of career mode yesterday and made it up to the second to last boxer. BY far my favorite bout in the game thus far was versus Aran Ryan. He didn't have much character in SPO, but now... just wow. Dude was off the wall, and the manner in which you fought him was so counter-intuitive, it was crazy.
I also spent some time messing with the Exhibition Mode which is also very cool. You can hone your skills on your current challenger, or take on boxers you've already crushed. All of those boxers now have three objectives tied to them for you to accomplish which unlocks some stuff. I did all of the Glass Joe challenges which were all very inventive, and very fun to accomplish.
I'm actually ridiculously excited to go home and play more, the game is that good. This has easily become one of my favorite Wii games over the course of a single day.