This is way better then the old PDC Darts games on the Wii. The controls have much more precision, to make anyone feel like a pro (I can't consistently hit doubles or triples when needed in real life). This one does feature WM+ support (on the main menu, there's the 'view instructional video' for motion plus... that's what hinted me to it), not sure how big of a difference it makes. And yeah, it's too bad they omitted multiplayer online.
On an alternate note, this is another game that won't load at all for me using USB Loader GX... looks like I'll need to completely switch to CFG USB Loader, works fine there.