I also find the iOS Gaming subreddit, TouchArcade forums, and the iOS (and Android) Board Games blog (on BoardGameGeek) to be good places to discuss and learn about iOS games.
You could also add Pockettactics for more premium game coverage though they are a bit centric around strategy and RPGs. Furthermore there is Pocketgamer but it has abhorrent design which they promised to renew this summer but apparently did not manage to finish.