Seems like everybody hates Flash.
A few people don't. Fran Krause, Nina Paley -but lets face it, they're just weird.
While I personally have a hard time with the program (it's minor interface peculiarities are major problems for me), we use it at the studio with some regularity.
Not all of the time, or even as a default. Most studios currently "think with Flash". They look for the answers to a potential film's questions principally in the program.
Sometimes it's just easier than drawing on paper.
In this project (currently in production), we've done the animation as though it's on paper.
Liesje Kraai created most of the keys, some rough, some cleaned up. Christina Riley takes it from from there, cleaning up in-betweening and filling keys for shots with only storyboard layouts.
Most important, we're offered a great crutch with Flash. The whole piece, about two minutes, is lip synched in Khmer. No one here speaks the language. Of course it's possible to animate in a strange language, just follow the standard process and work closely with a translation.
Here you import the audio and work directly with it. In this case, we have great reference footage from which we're "stealing" the lip synch.
The trick is to get something to look good. That's where the art production comes in. For this, we wouldn't do it in Flash.
Everything gets exported as PNG sequences and painted in Photoshop.
Hopefully they'll all look like this.