Nikita - A huge FLOP in the CW's target demo? Posted by Tariq at Saturday, September 25, 2010 Cancelled Shows, Nikita, SpoilerTV Article, Vampire Diaries Tweet

On the surface Nikita seems to be a hit with total viewers over 3 million on the CW, however with a closer look at the women 18-34 demo which is what the CW sells ADs for Nikita is the worst rated CW show this week (Pending Supernatural / Smallville ratings)
This week in CW W 18-34
Vampire Diaries 2.7 W18-34
Gossip Girl 2.5 W18-34
Top Model 1.9 W18-34
90210 1.8 W18-34
One Tree Hill 1.8 W18-34
Hellcats 1.7 W18-34
Life Unexpected 1.3 W18-34
Nikita 1.2 W18-34

Which is perfectly in-line with how the CW treats the shows, Vampire Diaries,Gossip Girl , Top Model and 90210 have full seasons.
One Tree Hill and Hellcats have 13 episodes + 6 scripts ordered
Life Unexpected and Nikita have only 13 episode orders.

CW still has reality show Shedding for the Wedding pending a timeslot and could still theoretically pickup HMS, it could also import a Canadian shows like Lost Girl which is produced by CW media. Plus last season 2 out of the 10 hours the CW programmed aired repeats most/all of the season (Wednesday 9 PM, Friday PM) so they could theoretically cancel both LUX and Nikita.
This week Nikita lost 56% of it's lead-in's Women 18-34 viewers. Nikita is also a pretty expensive show for the CW to produce.

Source : SpoilerTV