Overhyping is the worst thing a mod team can do. The best way to release a mod is by developing it behind closed doors without any hype, then suddenly release it to the public. The best example about this that I can think of is the release of Finnish Defence Forces mod (cheap plug) for Operation Flashpoint (cheap plug). Practically no-one knew about it before the first release and it was the first full conversion mod for OFP. It was amazing, with all the hyped up "coming soon" mods suddenly pissing their pants. In my mind the EB team made a few too many teasers for 1.0, but that was a little different situation.