To me Godot became legit with version 3 adding physically based rendering like everyone else. But arguably there is one AAA game, the Sonic Colors: Ultimate remaster. Sure the studio modified Godot to some extent (but reportedly not enough to prevent e.g. scene loading in stock Godot 3) and they also did whatever was needed to port to the Switch (https://www.youtube.com/watch?v=D-RnhgZCqn4), PS4, and Xbox (4k@60hz) but a nice looking 3D game from a big franchise sounds legit enough to me. The creator of Godot was surprised though because he's intimately familiar with 3's limitations, but 4 is about done and is better in pretty much every way so maybe we'll see more of that sort of thing, and possibly with stock Godot. He did speculate that one reason Godot can be attractive for certain studios working on a franchise with an almost guaranteed minimum of sales is that it's one less thing to have a license fee for. Unreal Engine is amazing, but if you expect to gross over $1m, is 5% of your revenue each quarter forever afterwards worth it? It's not a straightforward question, but just 1.025 million units at $40 is a $2m fee, could you use that $2m to hire developers to patch up whatever shortcomings in Godot you actually need for your game and still ship on time? Or create a custom engine, as still happens occasionally?