It hardly can be considered for a serious commercial project without having a engine team already. But for hobbyist it might become a good choice and the popularity definitly helps.
Right now the most successful game made with Godot Engine is Cruelty Squad (https://store.steampowered.com/app/1388770/Cruelty_Squad/). Regardless of if you would call it “professional” or not, it was one of the most noted indie games of 2021, had great reviews, and probably was much more commercially successful than your average Unity/Unreal “professional” indie title (given how so many of them flop). Same goes for some highly successful RPG Maker games, which usually people would not call it a “commercial-quality” engine.
I think there’s a lesson here: don’t care that much if you’re using a “commercial” quality engine or not, just care if the engine will give the right tools to make the game that you envision.
Here's an absolutely beautiful commercial game made in Godot.
But even aside from that, I'd argue Godot probably had little to do with the quality of the port. There's ample evidence that you can make buggy games with any engine, and the Sonic franchise in particular seems to have a long running problem with SEGA pushing releases out half-baked.