I thought I would like them when they were first revealed. After I used them, I found them to be lackluster, with Simisage being half decent. Simipour and Simisear just don't learn good enough moves that work with their Attack stats, which are only decent at best. From unoriginal designs to below average stats, I was disappointed with this trio.
I thought the type changing gym was a good concept, but it was implemented too early in the game to actually be exciting. If Chili, Cilan, and Cress were the second gym leaders, it would give more of a challenge.