It wasn't that long ago that most waterproof shells had mesh lining, and today many still do. The Nitro II themselves are a terrific outdoor pieceI was wearing a related piece, a mesh-lined Patagonia anorak from the mid-ninetiesjust the other day while skiing in a near-blizzard. Kept me bone-dry and comfortable. And they'll work just fine as a mountaineering shell or pant, too.
It's true that mesh-lined garments don't layer quite as well as three-ply pieces, which replace the mesh with a layer of fabric laminated to the back of the waterproof-breathable layer. The mesh can also "catch" a little when you're doing extremely gymnastic moves. And, yes, it's sort of conventional wisdom that three-ply pieces are a little more durable because the inner layer protects the waterproof-breathable layer better. But if it hasn't been an issue in skiing, then it sure as hell won't be an issue when climbing. So tell the moron who gave you this advice to go suck an ice ax. Actually, those yahoos sound like borderline fascists.
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