I really didn't think that there was any bad models in 40k, some may have a really specific niche, but almost every hq/troop/fast attack/ heavy support/eliteseems to have it's place

but the deathwind missile launcher?

you can only use it once, need to have at least a minimum 24 inch distance, but it's still useful if your going to fire at a target 27 meters away (?)

strength 10 and AP1 is wonderful...bu t you only get a blast radius between 3 and 6 inches?, how is the manticore (admittedly AP4) not superior in every way?