They were never very good after Steve anyway. The pre-recorded ones are watchable, although the whole event can drag on and on. There should be an hour-long presentation, and then perhaps a two-hour in-depth presentation for those wanting more detail.
Sadly, the pre-recordings are no longer a novelty and come across as a bit too slick, too corporate and not quite human enough. The whole point of doing things live is that you are putting yourself out there for the fans and followers, and will risk making a few mistakes. Taking that risk was the humanity of it all.
Like the Apple HQ building, these pre-records can come across as perfect but a little cold.