For the time, OS/2 was an amazingly good OS. It shamed NT, revealing what a complete piece of shit NT was to use. Most anything good in NT was directly stolen from OS/2. The legacy of OS/2 lives on in Windows today. But it took them more than a decade of development to bring parity to what OS/2 originally delivered. At the time, the only thing mainstream which could compare was Unix and Next (IIRC, also ran a Unix).