It's just selling a scam. I've never been impressed by a flash game, but I'm impressed by programs written in general languages daily and for longer than flash has existed.
The worst thing about tech is people who don't know any better get advertised tools that aren't sustainable and aren't suited to the job. If someone sees a flash game and says "WOW! that's so cool I wanna do that", then I don't have problem with it. But if people want to learn a language and are handed an SRS app, or want to make a unique game and are told to use an engine that's when it becomes harmful (and in many cases viral due to network effects)
I gotta admit I don't really know what you're talking about.
I think Flash was fun to develop in. It was easy and fun to write a game in it and it was something a lot more approachable and easier to distribute than trying to cobble together something with OpenGL or DirectX.
Also, I think a lot of the games on Flash actually are fun. I played through Mystery of Time and Space a few months ago and it still holds up. The puzzles are clever, the jokes are funny, the art is likeable, it's a good game.
But what I liked about Flash was that, because it was so approachable, there was a lot of creativity to stuff. A lot of the games weren't good in any kind of "objective" sense, but there was at least a distinct lack of cynicism with a lot of them. The people who made the games weren't doing it for money, they were doing it because they thought it would be cool to make a game. Some games, like Pico's School for example, were unlike basically anything that had come before it. Is Pico's School a masterpiece of game design? Nah, but it's certainly unique, and it was something that could be played on pretty much anyone's computer.