Halo is a game with a big budget & a console seller. How about we compare it to a 3ds game like Mario Kart 7 which sells for $38.22 on walmart.com right now. So, what you call a $37 smartphone app I call a game that allows you to play on your xbox, computer, and phone all for less than you would pay for some handheld games.
Hate to disappoint you but $7 isnt too much for a phone game, if it is a quality game. As a matter of fact, a few of the gameloft games that were announced & coming to WP8 are priced at $7 on apple's app store. Is this game worth it? idk, I think we'd have to play it before saying what its worth....at least the demo
Also, a game like Angry birds is very basic(popular, but basic), so saying because they charge $1 every other game should imo is wrong. For example, games like this(MC4) shouldnt be a $1 because the time it takes & the dev needs to make them isnt the same as angry birds....I would think its not the same for this skulls game, and also AB sells millions of copies, so they can afford to sell they game at a much lower price
Modern Combat 4: Zero Hour - Extended Reveal Trailer (Official) - YouTube