Well now I know what they're talking about when they say that the game leaves a lot left....  That true ending is very annoying...  I won't spoil any of the specifics... Let me just say there had better be a game that completes the whole story.... and doesn't just leave us hanging like that....  But, that last boss battle was actually kind of fun.  TIPS:  If you're on the tank, try to stay on the larger area of the lower part (not the turrety area).  Then, Brock'll try to jump down and attack, so you jump kick him, or double lariat him, and then he just gets back up, and just keep doing that 'till he's done.  I was actually able to finish him with 1 health for the majority of the match, which I was really glad with.  So, I will just say again that this ending... does leave a lot to be desired.