Wow, these episodes were meh. Siren was an absolute joke. She seemed to be a worthy villain in the first part, but then in the second part she did nothing but flee and get beat. I cannot believe Haruto even had to go to Infinity form, they should have just had him use All Dragon to beat her. If it weren't for Siren, these would have been great episodes, but because of her, they were average.

Infinity does seem to have the writers confused, don't it? It seems to have no real stand out powers considering it's the "final" form and as such we've seen Haruto use it on foot soldiers and then go ahead and beat the Phantom with Flame Dragon (and stuff like that), it's dumb.

I swear, Mr. Kumagai is the best gate, period. Heck, he's just a plain good character. Honestly, my favorite in Wizard. That being said, I don't think the others are bad. Between Mr. Kumagai, Shunpei standing up to Haruto, and Haruto actually being fallible for once, this episode has to be my favorite in the series, hands down.

I also don't like Infinity because it seems Haruto know has an infinite amount of Mana. I like it better when shows like Blade and OOO had there be a limit to why the ultimate form should be used.

And if Siren is such a badass, why did they wait until this long to use her? You would think she would have been one of the first ones they used way back then.

He doesn't. He can run out and, if he does, Infinity doesn't work. The show just doesn't really do anything with that beyond the one time it happened. :(

I do agree, though, that an ultimate form should have drawbacks. Otherwise there's no reason not to just use it all the time like Kiva.

Was there a drawback to Hyper Kabuto?

The only ultimate forms with real drawbacks are Stronger Charge-Up (discharge the power in thirty seconds or die), Ultimate Kuuga (have a pure heart or turn evil), Blade King (use it too much and turn into a Joker), and OOO PuToTyra (berserker fury, risk becoming a Greed). Shining Agito had a minor drawback of needing sunlight for full power, but the rest were pretty much just strong power-ups with no downsides.