A few thoughts:
Most people came to DreamHost because of positive recommendations from people they trust. There is a reason for that. I just read a post from a user that has been with DreamHost for 6 years, and stated that they have been mostly perfect up until about a month ago. In the last month, they have experienced some downtime realted to various issues. Unfortunately, yesterday's outage was pretty horrific and will leave a lot of customers scarred and angry.
Personally, I have been with several other hosting providers, and DreamHost is by far the best, with the exception of yesterday (which was caused by a DDOS attack on a customer's web site, bringing everything down).
I have faith that they will resolve these problems soon. I do not work for them; I am just a customer. I know that it can be particularly frustrating for a new customer to sign up and then have to deal with the type of outage that happened yesterday. And DreamHost will likely loose some of those new customers. But if you search through the forums for customers who have been around a while, they mostly say "DreamHost has been great until these recent events..."
I've been with them a year, and I'm giving them another chance. They couldn't help the DDOS, but what they can help is how they react to it in the future. They will be releasing a detailed report of what happened and what their future actions will be to resolve this type of problem in the future. I say everyone at least read that report before you leave DreamHost. And don't assume that you will wind up with a better host if you do decide to leave.