i got the dreamcast on launch day back in 1999 and for retro purposes I rebuilt my collection last year .
it was probobally the most underrated console to date.
segas problem with the Saturn was its difficulty to code for and the way they had been pissing off developers for the last few years so quite a few gave the dreamcast a wide birth(EA being the main one with its popular FIFA football game)even though they embedded it with Windows CE to make porting PC games easy.
SEGA had the idea of using the gigabyte CD rom disk known as a gd rom to help curb piracy that the PlayStation suffered with a normal cd rom disks (oddly not the Saturn)but they left a weakness in the system by allowing mini disks to boot without the proper security checks thus allowing those boot CDs to surface and gd rom games could be ripped down and burned to normal CDs and the whole anti paracy measures could be bypasses without the need for a mod chip.
segas thinking must have been that the system would be more secure as gd roms could not be read by a normal CD/DVD burner found in a PC but software was coded using the easy to program dreamcast that actually used the consoles own GD rom drive to read the disk.
the later verson dreamcast motherboard had this back door hack fixed but it was then too late.
had they used a DVD drive with better security and had a better relationship with developers the console would have succeeded and we could have now been on the DC 2,3 or 4.