I think you would have straight up cash for votes bribery rather than the campaign contributions we get now, so not much difference there, except more people would be bad at it so they'd get caught. So that might be an improvement. The people who don't take bribes would be voting generally from a position of benign ignorance rather that ignorance plus political self interest. Unclear how that would turn out.
The question is, who would the staffers be? If you left it the way it is now then they would be the ones with the real power, the ones taking the bribes, and the ones running Congress. The congresspeople would be figureheads. If you made the staffers randomly selected as well then they would mostly be bad at their jobs. Proposed legislation would probably be a mess. It would accidentally conflict with existing laws, would not contain what it needed to have to accomplish what it was supposed to, fail constitutional scrutiny, etc. I think on the whole it would be a disaster, just a different sort of disaster than the one we have now. Interesting idea though.
What I want to know is, who decided to schedule the damn thing at an hour when most Congresspersons would have a choice between attending it or blowing off a bunch of prior engagements in their constituencies and probably wasting a few hundred dollars in airline cancellation fees?
That was my first thought - this was probably a bigger turnout than the executive branch was hoping for.