Then shouldn't Nintendo make a sequel to that? I expect fans would want a complete story.
It doesn't end with a cliffhanger, just somewhat of a tease, the 100% ending of the original Prime is closer to a cliffhanger but still isn't there.
Halo 2 ends with a cliffhanger, Resident Evil Outbreak ends with a cliffhanger, Avatar season 2 ends with a cliffhanger.
OT: It needs more boobs.