I know exactly what you mean, one of the main reasons I bought my WP was down to the fact that it had Xbox Live compatibility and boasted that you would soon be able to play Xbox games on your phone, little did I realise these would just be the usual games that you can get on your apple/android phones like Angry Birds but with achievements.

Well, I kinda figured the games for the phone would be small before I got the phone, but I was excited that they would be tied into xbox. The whole selling point on the smartglass app was so you could link to the game you are playing and be able to see info about what is going on (maps, enemy stats, character status, et cetera). But all that seems to have been forgotten, and now we can't even get companion apps for games like this because nobody seems to care to make one for WP. I'd quit complaining and make one myself, but I wouldn't even know how to get started.