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speshelite, Campag made several MTB groups over a four-year period including Record OR, Icarus, Euclid and Centaur.
Shifting on the thumbies was good - accurate and by the standards of the day, fast - but the Bullet shift was pretty ropey. The cantis were quite a good brake but benefitted from careful set up which they often didn't get.
It's worth noting that Campag were actually ahead of the cirve to some extent, pioneering the idea of a micro-drive and the use of cassette sprockets on a carrier at the back of the crankset for the granny ring ... alas, the Far Eastern makers had the edge in aersthetics in the cockpit area and better OE distribution ... and had a much more aggressive price point at the entry levels.
Campagnolo at the time were suffering a little internally as well - and so bowed to what they saw as the inevitable and withdrew from the MTB market, re-focussing their attentions on their traditional, core market of road cycling, specifically racing. Although much criticised by the trade at the time, this retrenchment probably saved them.