Games that look terrible/generic shovelware but are actually amazing to play.

[LegitHyperbole]

CarX Drift racing online is one example. Game looks like shareware trash, cheap and generic but there's a reason this is highly costumer rated, it's an amazing feeling racing game that has an incredible feeling drift mechanic. 

Dust an Elysium Tail looks like a generic Metroid vania, furry game but it is one of the most satisfying 2d metroidvanias that exists. 

Beach buggy Racing might as well look like a mobile game but the fun in it is immense and it's up there with Mario Kart and Crash team racing in gameplay. So much fun.

Cat Quest Looks like a mobile game and in many ways it is, but it's actually really fun and has simple but oddly endearing quests and sstory. It's combat is as basic as it comes bit very fun.