AFnord: Just because a game has a mobile version does not mean it has to be bad though. World of Goo, Spirits, Anomaly: Warzone Earth, Call of Cthulhu: Wasted Land, Frozen synapse, Avadon: The Black fortress, SpaceChem & Waking Mars are all games with mobile releases and which are good or very good.
In all of those cases, the mobile versions came after the PC versions, and in many cases were respectable ports to Android and iOS:
And yes, we've likely seen good mobile-to-PC ports. There aren't many though - EDGE is probably the best one so far.
If you look at bundle mobile ports, some of them are so lazy, they still contain prompts of "tap to continue".