750 Tyrannid army: need help developing

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**TNF**

hey my cuz asked me to fix up his tyranid army but i dont no much about tyrannids

can some1 shed some light on this team?

Hive tyrant +venom cannon +warp field = 150

2 x [genestealler x 8] = 192

Gaunts x 8 + spine fist + without number = 64

Mormagaunt x 8 = 80

Warrior x 3 + death spitter + scything talons = 78

Carnifex x 1 + venom cannon + scything talons + scythe tail + rending claws + bonded exoskeleton + extended carapice

wats wrong with it and wat can i do to make it better?