I think so. They nail the spectrum of '70s rock tones very well; even if the band in question didn't actually use one, interestingly enough. For example, it'll nail Aerosmith's Rocks tones. You just gotta rein in the treble a bit!
My first pedal. I bought one while on the road in 1979. Not a lot of output, even with both controls cranked, but it nails that old rock sound. Higher amounts of gain increase high end. Lower amounts of gain have more low end, but again there's not enough output to actually boost with the gain down. The older Voodoo Labs two knob overdrive is a close cousin and has a lot more output. Worth checking out.
I think guys like Rich Williams (Kansas) and Dave Murray (Iron Maiden) used a Distortion + with the MXR 6 band EQ to get that really crunchy, defined Marshall tone they had back in the day. I have a Whirlwind Gold Box Distortion and a Boss GE-7, I should try them out this weekend and see if I can get close to those tones with my JCM800.