I have never been a fan of M:TG, but I have gone through trading card phases. I eventually grew out of them though for the same reason you were afraid to get started on them, the sheer addiction. They are scarily addictive though, I will say that. But I can see why they would want to put it on the XBox to help increase their audience, because a product needs to adapt for an audience to survive, and that is exactly what they're doing here.
Well, that and the fact that they were banned in both schools I went to as a child and by the time I went to secondary school I had grown out of them.