Sure, but plenty of other games have managed to achieve this desired level of immersion. It's not unreasonable that gamers expected to find at least the level of in-depth gameplay we've gotten used to in other titles that banty about the RPG and/or MMO titulature.
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RPG's are good at blending a deep, interesting story with loot hunting and upgrading. Unfortunately, Bungie forgot half the formula. That's why this game has no personality, and appeals only to gamers who suffer from OCD.