http://1and1sucks.info/
When I first got involved with some solo web projects again I decided to go with a cheap host to experiment. We use 1and1 at work and although the support is bad, the hosting was pretty stable and I had much experience with the CP.
Now I regret even touching 1and1. I'm losing money as I type. I was able to kick things into the next gear quickly with traffic and earnings and as soon as I did, problems started popping up left and right.
The sites on one account suddenly started getting constant 500 server errors and despite repeated contact with "support", the problem is still at large. First, they didn't even understand what I was taking about. Then they tried to blame it on scripts that worked fine before (made no changes). Then they started changing my .htaccess files - which did NOTHING to help the situation.
Meanwhile with account number two, they claimed two of my sites were using most of the resources on the server. I was told to either go dedicated or bring my sites elsewhere.
I just signed up with Liquid Web because of their long-standing reputation. 1and1 is now my "beater host."