I've used Articuno before, in fact, back in 3-3, I used Scarf Articuno on the suspect ladder as a 100% Garchomp counter, or close enough to it. It had enough defense to not be OHKO'ed by Stone Edge, but also OHKO'ed Garchomp. YacheChomp was slower, and was 2HKO'ed, so Articuno won barring a Crit/Miss due to Sand Veil.
No Garchomp I actually faced beat my Scarf Articuno. 0_o
Anyway, back to the point at hand, Artiuno's offensive movepool is garbage, and with all the Fire types in NU, Ice is actualy quite a poor attacking type, especialy due to lack of Dragons and Flying types being used. Full Stall in NU is simply not viable, and Stealth Rock, which is often set mid-game, and thus, is hard to stop, rips off 50% of Articuno's HP.
Speaking of attacking types, I have an idea for the next NU Smog Article:
Attacks and you, in NU.
Basically, there are many differences in the viability of attacking types in NU. Psychic is way up there, due to lack of Steels, and, aside from Skuntank, common Dark types. Flying, which fails in OU, is possibly the BEST attacking type in NU, simply because nothing more common than Manertric resists it.
Could make a paragraph of it. Coupled with a few other 'Differences in the Metagame from OU' paragrpahs [Ie: Lack of Stall viability], could be interesting.