For it's time, it was "crazy fast." It was also pretty much the ONLY 3D accelerator on the market, so naturally it was the de facto standard.
Yes, it's fill rate was 50 mpixels/sec. Voodoo 2 had a default fill rate of 180 mpixels/sec, & V2 SLI had a fill rate of 360 mpixels/sec. I still have a 100 MHz V2 SLI combo in beside my GF2 GTS, which provides a 400 mpixels/sec fill rate for Glide games.
Viper GTS