I've seen all kinds of games people develop and post on app stores and indie game sites. What I noted is the lack of original ideas and innovation. Lots of games that look that they are developed by seven year olds, too many 2D side scroller mario clones, too many sonic clones, and a lot of stolen assets or plainly drawn graphics. Few games have original characters but they are also 2d side scrollers with exact mario style gameplay. For the few 3d games, most are FPS zombie shooters, also with stolen assets, many models with no animation. I see a lot of android games with the "made with unity" logo at the start. Obvious glitches and poor mechanics that the developers don't bother fixing, and a whole lot of ads.
For me I have brilliant Ideas that I have got planned for 28 games I intend to develop. Most of them will be 3D and many will be AAA kind of games. Something few developers have done on the hobbyist / indie stage.