I don't think any of these are bad games, most of them got decent reviews... It's just that compared to what Nintendo and Sony Computer Entertainment were releasing at the time, they were seen as weak. Really, only Halo was able to carry the Xbox First-Party wise. But we should appreciate the amount of bizzare, weird, if sometimes average games that Microsoft took in. They were a newcomer at the time, so they had nothing to loose, might as well take anything you can get.
Out of curiosity, can you list the GameCube and PS2 1st party games? I skipped the OG Xbox as none of those games interested me however Nintendo and Sony weren't that much better.. well except the traditional Nintendo IP and 3rd party game for Sony.