I agree that there are lots of poorly made games that predictably flop. However, it's also worth noting all the bits of a game that matter outside of the executable. Knowing where your audience hangs out and how to reach them, having the ability to make compelling trailers and screenshots, having press contacts to help promote your game, crafting a viable monetization strategy, etc. All these things matter more than most observers would think when differentiating between known and unknown games.
It also really depends how you define "successful". I've put out 3 mobile games in the last few years as a solo or mostly-solo game dev[1]. Each one has been game of the day on iOS and received other prominent featuring. From a critical and editorial standpoint my games were successful. From a "is this a sustainable career that supports me financially" standpoint, not so much.
[1] You can find my games at https://birdcartel.com Let me know if you think they fall into the unfun/janky bucket.
It also really depends how you define "successful". I've put out 3 mobile games in the last few years as a solo or mostly-solo game dev[1]. Each one has been game of the day on iOS and received other prominent featuring. From a critical and editorial standpoint my games were successful. From a "is this a sustainable career that supports me financially" standpoint, not so much.
[1] You can find my games at https://birdcartel.com Let me know if you think they fall into the unfun/janky bucket.