Definitely worth it although you will certainly end up intending to play for 5 or 10 minutes and still be sat there hours later.
I've never played any of the football management games so I have nothing else to compare this to. I might buy the PC version through Steam and see how they compare and I have to say there are certain elements that I find rather fiddly to use the touch screen with. For example, selecting your starting eleven. I sometimes drag a name and it ends up replacing a player with a complete random player that my finger was nowhere near. Also it seems to be a bit unstable, mine has frozen a fair few times but at least it's got a half decent auto save.
One other thing that annoys me is that I can't seem to find where to swap players around while in a match. At half time I changed my formation to a more attacking style and it ended up putting Andrey Arshavin as a holding midfielder, I couldn't find any options to move him around which was frustrating to say the least.