Indeed. Inuyasha's group shouldn't've come out of that arc in one piece. There were waay too many close calls and dues ex machina. It could've actually ended up getting interesting if Kagome, Miroku, and Sango had all died in that fire.
But hands down, the Shichinintai had the most unused potential in that series. Aside from the throwaways, Renkotsu, Jakotsu, and Bankotsu were actually pretty decent characters.
Oh lawd, I can't believe I can still remember all this shit from what, six or seven years ago?