Age of Sail II (2001) It was named as the worst game of the year by two different PC gaming magazines.
Stronghold 3 (2011) After the first brilliant release and a lessor second full 3D offering, the 3rd simply sucked because it was poorly designed and buggy to boot.

Both highly anticipated and both buggy and disappointing at release. Patched numerous times and every patch broke as much as it fixed. Within a month, both pretty much abandoned by the developer.

Those taught me to not buy at release and wait for reviews

Cheers

Artillery adds dignity to what would otherwise be a vulgar brawl.