Back in the day, mid-late 80's, Marins were THE bike to have - they were for me anyhow.
From what I remember - and I'm sure somebody will correct me - they were one of the first specialist MTB brands that were stocked by many UK bike shops along with Muddy Fox, and as such were often 'the most expensive bikes' in the shop.
I'm sure that I'm not the only one that 20 years ago aspired to trade their Raleigh for a Rocky Ridge or Indian Fire Trail with its purple anodised stem and spoke nipples!
There seems to have been a backlash against them a few years ago, usually by people who don't understand why people can have fun on a bike even if it hasn't been welded from kryptonite by the light of a full moon.
I won many a race on a rigid Pine Mountain in the early 90's and 3 bikes in my garage are Marins. Good bikes.