Gokuu should have turned SS3 when he fought Tamagami 3. Saving SS3 for near the end of the show is stupid when it's such an outdated form.
Episode 17 should have been SS3 Gokuu, SS3 Vegeeta, Coo, Doo, and Tamagami 1 fighting Gomah. Shin and Glorio are way outclassed, so they shouldn't be...