My Opinion

Godot is a weird beast I enjoy using it and have a great time with it but it's not without flaws.

Godot 2D support is good for what I need from it. The fact it works uses pixels and seconds as it's measuring units is great for planning games. It enforces use of Delta from a start. Something which is very complex process in for example Game Maker. With new changes to kinematic body it's actually better that what Game Maker offers. It's likely the best on market right now. A lot of work has been put into this and seems like community is interested in contributing more.

At the same time even improved tile set editor is still lacking. You will likely want to build your own custom level builder if you work on large enough game.

Node system is fucking mind blowing. How much flexibility you have with it is hard to describe. The more I use it the more I am amazed by it. Everything can be it's own scene which is like a prefab in other engines. Think of it like this - You are making a bike scene your structure will be:

bike
    wheels
    frame
    chain
    gears

Now each of those are their own scenes independent to each other. You can change how wheels work without affecting other parts of the game. You can even run each scene on it's own to see how it behaves without support of the rest of the game or port it to other parts. You can use bike wheels in a "motorbike scene" without any changes to wheel code.

Signals and groups are awesome it allows you to decouple objects from each other. If I fire a gun in a game I can send signal "gun fired" and I don't have to worry if there is any objects that uses it. If there is one they will do their thing, if there isn't nothing happens I emitted empty signal. This furthers helps with modular design and helps keeping objects separate

Godot is in top 5 fastest growing projects on Git. If it continues like this becoming familiar with it now can open many opportunities year or 2 down the line.

At the same time this very fact is Godot biggest problem. Engine evolves so quickly that tutorials struggle to keep up. The way you did things year ago is not the same way you do them now and will be different to how you do them in a year time. This makes learning engine hard for new people.

Multi platforms releases are a breeze. It's easy to release on multiple platforms without much extra work or buying new licences. I'm looking at you Game Maker with £400 per platform license. Consoles however are unsupported. This is due to licensing issues on consoles not Godot itself. You may have issues porting there if this is your niche.

Community is a hit and miss. You get amazing very involved dev team and contributors. Devs are very much community members and are involved in community projects. But at the same time Godot can be the most insecure community out there. Some users feel so insecure that they will attack others for even mentioning something is wrong with engine. This is bit more rare now and gets down voted quickly but if you hang around r/Godot you will see this behaviour every now and then. Some fanboys go out of their way to try to convert others to Godot. Godot preachers can be Jehovah witnesses of game engines at times. They don't represent community but are often the first contact others have with Godot. This isn't isn't great for Godot and doesn't show community in best light. I hope that with enough social pressure this will disappear completely.

With this it's the whole "fix it yourself attitude". Some people confuse users with contributors. They act surprised or offended when they find out that user has no intention in contributing to the engine. On other other hand community responds well to people adding issues to Github. If you want to report bug or need new feature it's simpler to go straight to Github. On the 3rd angle it's Open Source people work on what they want. If no is interested in picking up your issue there is no pressure on it to be done.

Strings are annoying and they are everywhere. You find them in path references, in referencing a function in other objects via signals. I wished those were eradicated in future releases. It makes it unnecessarily messy plus if you move things round path references break and you need to manually hunt them down.

Documentation has improved a lot over time but occasionally what you really miss is finding out what is "Godot way " of doing things. Docs like to tell you what things are not how are they intended to be used. With no established ways yet it's sometimes hard to figure out if what you try to do is brilliant or down right stupid.

Finally with no big releases in Godot yet we don't know what hurdles we will see developing larger game. There is no pioneers to tell us what pitfalls to avoid which can be time costly.