Season 2 (or is it 3 and 4?) picks up. Mirai isn't quite as dorky. Mirai's defeat at the end of season 1 and his going against Ultra Father marked a semi-drastic change in tone of the show. There still were some really corny episodes, but they were enjoyable.
I liked episode 39 ("Muteki no Mama" or "Invincible Mom") even though it was really corny because it took the focus off of Mebius and Crew GUYS, putting it on the lunch lady Hinode (who never appeared before then). Also, Hinode is a milf, IMHO. Furthermore, she looks fucking badass in Serpent Alien armor.
(http://www.geocities.jp/harukuni_yanagisawa2/image/mutekimama2.JPG)
And then there was episode 41. I must have had habanero pepper residue still on my fingers when I rubbed my eye while watching that episode... It was a tribute episode to Ultraman 80. I know the Ultra series has had kaiju babies, but this was the first time I've seen a kaiju cry. It was a melancholic episode. The school from Ultraman 80 was going to be shut down and consolidated with another school in the district. Two of the former students (now adults) visit the school and meet with one of their classmates who became a teacher there. The three decide to host a class reunion at the school and while they're planning it Mirai passes by investigating some Minus Energy readings on the school grounds. They ask him to try to send a message to Yamato Takeshi (assuming because Mirai is part of GUYS he'd have access to UGM records), who was Ultraman 80's human alternate. Mebius tells 80 his students would like him to show up at the reunion, but 80 declines, ashamed that he was unable to counter Minus Energy. The alumni hold their party, reuniting some of the original cast from "Ultraman 80". Just then the school building itself emits high levels of Minus Energy, causing the monster Hoh to appear. Mebius attacks Hoh, who is actually excited to see an Ultraman but is then disappointed that it's Mebius. Ryuu shoots Hoh but the attack passes right through; only Mebius can harm Hoh for some reason. Hoh soon pins Mebius to the ground, pummeling him repeatedly... WITH TEARS. Suddenly 80 appears and throws Hoh off of Mebius. Hoh is excited to see 80 and lets 80 blast him to smithereens without ever putting up a fight. The alumni cheer for 80 and then thank him for all their teacher had done for them. 80 flies off then returns to the school as Mr. Yamato. Mebius realizes Hoh was really just a ploy (by the school building itself) to get 80 to come back to Earth for a day.