atari never really was a serious computer threat, they had no big box systems so nothing was very expandable, and they only had what, one system with anything other than a 68000 cpu.
atari put all its eggs in the jaguar basket but didnt get the third parrty support it needed and got ripped in the gaming mags. it was a very capable system for the time.
saturn < 250,000 poly/sec
playstation < 250,000 poly/sec
n64 < 100,000 poly/sec
jaguar < 35,000 poly/sec
32x < 30,000 poly/sec
3do < 30,000 poly/sec
all above were estemated from chipset timing and estemated real game capabilities
jaguar had 3d matrix arithmetic hardware and hardware gauraud shading that could easily exeed 53,000 poly/sec but could not texture map at the same time. texture mapped stuff had to run half in hardware half in software
btw jaguar, playstation, and saturn had 2d capabilities that were limited by the bus capabilities, and the jag ahad a full 64bit bus that was 1.74 times faster than the playstation bus. the n64 had a 32bit bus (even though it was the jag that was slammed in the press for not being fully 64bit)