User blog comment:Doo2you/Nocturne as Mid/@comment-1990160-20120525113803

I'd say that you would be extremely weak early game. I'll use Cass as an example: you can harass with Q, but she'll retaliate with her poison Q every time you go in for cs. Oh, you can shield it, but then you're done a decent chunk of mana, and she can try again in 3s. If you ever do it, definitely build Hexdrinker first, and possibly have flat MR runes/masteries, but in general, Noc is not optimal for mid lane. Sivir is actually viable in mid, with range and a spell shield that can restore mana.