It's getting strong ratings, but truth is, pretty much every show these days is doing worse than few years ago. Even the #1, the ever unbeatable Sazae-san, does around 17%, when i remember seeing it doing ~25% in a regular basis not too much time ago.
Last weeks list, if anyone's interested:
17.6% Sazae-san (06/05 18:30)
13.2% Chibi Maruko-chan (06/05 18:00)
11.3% Gegege no Kitaro (06/05 9:00)
10.5% o*ne Piece (06/04 9:30)
8.2% Yes! Pretty Cure 5 (06/05 8:30)
5.1% Nodame Cantabile (03/05 00:45)
4.9% Pokemon DP (03/05 19:00)
4.8% Keroro Gunsou (05/05 10:00)
4.7% Naruto Shipuuden (03/05 19:30)
4.6% Zenmai Zamurai special (30/04 10:00)
Offtopic:
Keroro Gunsou over Naruto Shippuden? HA! XD Now it´s Pirates>Aliens>Ninjas…but I can understand, Shippuden is so damn slow...but I´m also pretty amazed about Yes! PC5...