After finishing recently I can safely say Ultraman Taiga is the best Ultra series ever made. The monsters had their uses, the cinematography was top notch, the effects went above and beyond their roles, and had renovation in the writing, turning many former villains into heroes in the end. Here is where I rank it among all the entries.
Taiga > Dyna > Gaia > Nexus > Geed > Jack > Mebius > Joneus > Ginga S > Tiga > Ultra Galaxy Mega Monster Battle: Never Ending Odyssey > Ultra Galaxy Mega Monster Battle > R/B > Powered > 80 > Ultraman > Max > Leo > Great > Neos > Taro > Origin Saga > Ace > Ultra Seven > Orb > Cosmos > Neo Ultra Q > X > USA > Ginga > Ultra Seven X > Ultra Q > Dark Fantasy > Ultra Fight Victory > Ultra Zero Fight > Nice
Taiga proved to be the best of Ultra, Drive proved to be the best of Kamen Rider, Kyuranger proved to be the best of Super Sentai and tokusatsu as a whole, Delta finally gave the Macross franchise an entry worthy of a perfect score, and Gundam Build Divers proved Gundam could shine after Okada and Raildex guy nearly left it in ruins. I don't see a better decade for the big five any time soon. Here's to Ultraman Z, I wish to die a quick painless death and in the endless ocean of pain and suffering called life you'll be a life raft. I hope these meat shackles called a body can be unlocked so my soul can never feel misery or anguish again.