The only reason NT on Alpha failed was market share driven by DEC's hardware prices (the only source of Alpha based servers at the time) was about three times the equivalent i386 server from Dell or Compaq. I ran a shop fully populated with Alpha's running NT 3.1, 3.51 and NT4 at first, we switched to Dell i386 servers because of this.
The DEC Alpha's did have very good availability and uptime, but for three times the cost, and very limited to non-existent third party software (backup software, security software, etc.). It was very hard to justify the expense. Not to mention being locked in to DEC for auxiliary hardware like NICs and RAID controllers which limited the selection severely, and again at triple the cost per unit.
DEC Alpha's running NT were great runners, but their hardware pricing, selection and availability is what did it in, not weakness of the OS on that platform.
Methinks you should get your facts and root causes for the failures in the market of the Alpha/NT product straight before you spout off.