I have 43 sites up on dreamhost...and am adding more weekly. The email issues for me haven't been too too bothersome. Some downage, and some filtering questions for clients. I am on about a dozen different mail servers, and the only one that has been giving us problems of late is murdock (which hasn't had problems for us in two days.)
I am lucky that I haven't been on the mysql server that has been slowwwww of late.
I have to just sit back and wait, it would be way way too bothersome to ever move my sites. Plus, in the two years I have been with dreamhost, I have been quite impressed. I have been with quite a few other hosts (still have some sites on other hosts that is just too hard to move due to their high hits.)
I know that there are issues, and with all the new upgrades Dreamhost has had to make due to security issues in php, awstats, etc., I realize not all will be seamless. I let my clients know that Dreamhost is doing upgrades due to these security holes and that things might be a bit rough right now.
I realize it is hard for Dreamhost to ask their clients to be patient whilst they figure out what is going on. Acknowledgement, even just here in the forums, "hey were working on it, and here is what were doing, here is each server issue, and here is a projected date/time, but hey dreamhost users that date/time could change." I am not even sure if the problems that Murdock was facing are fixed, or jimmied, or they didn't do anything and it just started working on its own.