I would say more of a 3 and a half than 4 but 3 is too low.
I couldn't get enough of the demo and found it very addictive and fun so I was very excited to finally get the finished game.
First time loading and you automatically start playing champion mode. However like some others have said its with a fixed character and not someone you can create yourself (Legacy Mode).
Champion Mode has a very good storyline, almost like a film, and you can get immersed in it but it certainly lacks something. The fact that its a fixed route and that you can't lose means it becomes boring very quickly, made worse by the fact the fights are either easy or very challenging.
I'm yet to play Legacy Mode because you can't create a character you want unless you have a USB camera or download your real face from EA. The only other option is choose from a selection of presets which doesn't have the appeal.
So to sum up I like the actual boxing part with the FSC (Full Spectrum Control) but it's not like say FIFA where you can play random games, for me anyway, so I will be trading in very soon.