Well, it's good! Of course it's good.
I compared it with Delphi because, back in its day, it changed the RAD paradigm for the better.
Same here, I've never prototyped quite as fast in other tools, even GameMaker.
I mean the IDE does crash sometimes but otherwise it works really well.
It's really snappy, in fact even the 3.0 alpha works OK even on older PCs (like mine where Unity has been getting slower lately and Crysis no longer even runs).
With all the changes planned for 3.0 even the issues I had with GDScript will be mostly gone and I've seen C# in the pipes too.
My only big issue right now is the DAE import/export pipeline.
There's no surefire exporter and sometimes you have to try all of them.