I bought The Quest Gold last year (I think?) being very late to the party. In terms of a spiritual version of the Elder Scrolls on iOS, The Quest is the closest and easily the best open world game on iOS.
The Quest Gold had a ton of interesting content, with a variety of different playing styles and customisation. Like the Elder Scrolls, you could focus on the Main Quest, or spend time exploring, adventuring, indulge in skulduggery, sleep with prostitutes (as well as other important NPCs - in true Mass Effect style), customise weapons and armour, and gamble playing an excellent in-game deck-building game.
False heirs to the title such as Aralon had the depth of a puddle, and its limitations became apparent after an hour's play or so (soon deleted).
The one detraction was the very aged graphics. The HD version has addressed that flaw, and caused me to shell out £5.99 and re-start from scratch - this time as a BattleMage [Hitomi Tanaka].
Totally worth it!
P.s. Needless to say that my in-character name is completely NSFW, so don't go Googling either at work or in-front of your partner.