What goes up, must go down — and we’re talking about you, Ashton Kutcher: Two and A Half Men dropped 33 percent from its colossal premiere a week ago, but its week 2 performance was still pretty awesome for such an old comedy. Men averaged a 7.2 rating/17 share in adults 18-49 and 20 million viewers — enough to give it another comfortable win in the time slot, according to early results. It was also the night’s most viewed program across all the major demos, except in adults 50 and over, who still prefer their Dancing With the Stars. More on the sequins later.

Two of CBS’ comedies also took a (not entirely unexpected) dive but heck, it’s still the lineup to beat. CBS won the night in the demo (4.6/11) even though How I Met Your Mother was down 6 percent with a 4.4/12, 2 Broke Girls down 37 percent with a 4.5/11. Only the return of Mike & Molly was up 26 percent from last year to a 4.9/11. Each 18-49 equals 1.3 million viewers, if you’re doing the math at home.

Onto those dinosaurs on Fox. In case you missed all that talk about this fall’s most expensive show, Terra Nova debuted on Monday, averaging a so-so 3.0/7 and 8.9 million viewers. Fox says the drama improved upon its Monday average versus last season by 25 percent in the demo but dang, Executive Producer Steven Spielberg had to have wanted something higher for the time-traveling extravaganza. Given the huge investment, Terra Nova is definitely one of those shows that needs time to find an audience.

“Stars” like Nancy Grace and Rob Kardashian continued to turn off viewers to Dancing: The two-hour performance show only posted a 3.3/8; that’s down 18 percent from last week and its lowest rated performance show ever. Ouchie. Castle, as a result, paid dearly: It earned a 2.9/7, down 9 percent.

And more bad news for The Playboy Club. The show earned a mere 1.3/3 — down 19 percent. Ladies and gentlemen, do we have our first casualty of the new season? The peacock has nothing to croon about over The Sing-Off, either: It earned a 1.7/4, a series low.

As for the CW, looks like it was a fairly unremarkable roll out of Gossip Girl and the premiere of Hart of Dixie. Both earned a 0.8/2 in 18-49, but GG was the bigger favorite of the two among adults 18-34 (1.1/3 versus 0.8/2). Interestingly, Dixie attracted more eyeballs (1.7 million) compared to GG (1.4 million).

The bottom line: ABC was second in the demo for the night with a 3.1/8, followed by Fox (3.0/7), NBC (1.5/4) and CW (.8/2). ABC won the night in viewers (14.6 million), followed by CBS (13 million), Fox (8.9 million), ABC (4.2 million), and CW (1.5 million).

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