Yes, so am I. Hudson is tainted by their association with MP, it's clear that they are one of the few publishers that Nintendo will permit to have sales on their platforms. Hudson and SE should both really be considered first party.
It's a combination of the DQ name, SE's first party status on Nintendo consoles, and Japan's current fad-like obsession with games that play with just the remote. DQS doesn't even use an analog stick, so it can't be any good and shouldn't be taken as an indicator of any long term trends - Japan will wake up and start playing games again.
It sold more on PS2 than Wii. That's a clear indication that the real gamers in Japan still prefer Sony consoles as is right and proper. As soon as PS3 hits a mainstream price the PS2 gamers will switch. Numbers don't lie, PP15 will obviously do better on PS3 than Wii due to gamers' comfort level with the PS brand and associated franchises. Honestly, the game doesn't belong on Wii at all and the publisher knows it, that's why it's not numbered.