Yes, the uptime isn't good for me either.... but there is no other host which give me all the nice things DH offers.
Since: September 21, 2007
Total Uptime: 99.374%
2008 - Outages: 13, Uptime: 99.413%
2008, April - Outages: 2, Uptime: 99.779%
2008, March - Outages: 4, Uptime: 98.658%
2008, February - Outages: 4, Uptime: 99.713%
2008, January - Outages: 3, Uptime: 99.666%
I have the uptime checked every 30 minutes. My websites hosted with other hosts have 99.91% and 100% overall uptime in the same timeframe.
If you look at the TOS, as far as I remember DH doesn't give you a specific % value of uptime.
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