This thread is to discuss what you, over the years, have found to have either too much hype for what they turned out to be, or to make mention of great games that were released with little or no awareness they were in progress.
For me -
Overhyped: I haven't been paying that much attention to hype on everything for that long, so I'm not sure I could come up with anything for this category. In my opinion, some of the biggest projects like Orb or Spear EOD were just fantastic enough to deliver on all expectations. The only potetially overhyped mod I can think of is one that I'd prefer not to mention...
Surprises: Deadly Sleep comes to mind absolutely immediately in this category. Also I never saw any prior knowledge that ack was working on the second Acktung set, so Acktung 2: The Last Waltz easily fits the bill as well. Also I think Chrono - SOD Maps might also apply for this category. Those are probably just the few that pop in my mind first.