The % DeepDotWeb uses are the % under "28 days" on Dnstats
So this is the uptime % in the past month at 5/19/15 4:47am UTC
IDC-------------------------------------96.18%
Dark.Net Services-----------------------96.11%
French Dark Net------------------------ 95.74%
The Real Deal---------------------------95.74%
Babylon---------------------------------95.67%
Torepublic Market-----------------------95.51%
AlphaBay -------------------------------95.45%
Nucleus Market -------------------------95.34%
Kiss Marketplace------------------------95.19%
Silkkitie-------------------------------94.92%
RuTor-----------------------------------94.35%
Abraxas Market--------------------------94.22%
Dream market----------------------------93.90%
Oxygen----------------------------------93.47%
The Majestic Garden---------------------93.38%
Crypto Market---------------------------93.03%
Outlaw Market---------------------------92.88%
East India Company----------------------91.07%
Middle Earth Marketplace----------------90.74%
French Dark Place 3.0-------------------89.90%
Anarchia Bitcoin Marketplace------------87.74%
Ramp (Russian Anonymous Marketplace)----82.94%
French Marketplace 2.0------------------82.80%
Havana Marketplace----------------------81.71%
Haven Marketplace-----------------------80.94%
Mr NiceGuy------------------------------80.62%
BlackBank-------------------------------77.02%
Zanzibar Market-------------------------75.29%
T•chka Free Market----------------------71.58%
Absolem---------------------------------70.60%
Agora-----------------------------------68.98%
Tornado Marketplace---------------------62.93%
That's just sad Agora.
While some might complain that the markets we know and love have bad uptime, you also have to understand that the fact that they are popular makes them a target.
Oh and also, don't blame Agora(or any market for that matter) for someone DDoSing them.