It's just that Unity has a ridiculously low signal to noise ratio because it is very flexible and easy to get results, attracting every no talent or inexperienced developer, and the sheeple being the sheeple, associate it with low quality web based shit (which has become another ridiculous trope) despite the facts that it gives you remarkable control over it and if you can cut a deal to get he source, it's a developer's dream come true.
And then we have resident morons like draco or whatever his name is who are talentless lazy hacks who have had a go at it expecting a "mkae me a gmae!" button and didn't get anything done and then go on bitching about incomprehensibly ridiculous shit like how it is imposssible to get a complex and responsive good interface in Unity and a few other hopeless unlearned who take their word as gospel.
Admittedly, pure 2D is where Unity is weakest but then again, once you go with 3D assets over 2D backdrops, that fact loses significance because the game will basically be a 3D game.
This is terrific news because they will be very likely to release mod tools and even if not, it will be a far easier affair for interested parties to hack the game, so to speak, to mod it unofficially.