The title is a bit misleading. OS/2 (especially Warp) wasn't a failure from a technical standpoint. Rather, IBM treated it like a redheaded stepchild which detracted from its core systems of mainframes and AS/400s, because--you know--this pc on every desktop thing is just hype.

As an aside, this reminded me of an old Dilbert from that timeframe (mid-1995): http://dilbert.com/dyn/str_strip/000000000/00000000/0000000/...