I disagree. Projects like GTK totally blow your argument out of the water. With more development, I cannot see why EC's custom GUI system would not improve with constructive criticism, rather than a generalised blanket statement of all custom GUI's are crap.
I had a very quick play with EC tonight, and I didn't see anything particularly slow about it or the GUI.
I don't program quite as much as I used to, and my OOP skills aren't what I would call good... but, I personally found the language quite useable.
Hell, it's free for gods sake, what is your problem?

I am sure if you went and spoke to the author via his forum or IRC and pointed out to him what you considered problems in a reasoned and constructive argument... I bet he would make efforts to address the problems. But, to just slag the guy to death and call him a noob is a bit shitty IMHO.
Yeah, I know.... It's normally me giving people shit, and not defending somebody else... but this guy didn't advertise his product here, somebody else did. Yes, he popped his head in the door, says hi and gets a load of shit for his trouble.