Unlimited was a radical and unfortunate turn for what was possibly one of the greatest superhero cartoons (or just flat out cartoons) ever. It sucked most of what made the original series good and gave us flat episodes that are bad not because of completely bad quality, but because they squander so much potential. This is no exception.
Essentially the plot of this episode is about a jerk who gets bullied by the other heroes because he is not popular. He is not even that much of a jerk (in fact he is somewhat likable despite some cockiness) but the heroes seem to have some unknown grudge against him for no good reason. Even the civilians could care less, often mistaking him for Green Lantern (for no reason other than he also wears a big padded suit). Apparently Booster also found a way to turn Fry from Futurama into a bite size super intelligent robot who helps him in oh so convenient ways. Anyways, while the heroes are off fighting some generic super powerful bad guy, Booster also stumbles on one of those "the universe will end if this is not stopped" plots that provides a series of coincidences and inconveniences that stop him from stopping it after a minute.
The writing is poor because, along with flat dialog and comedy attempts, it cannot make the two plots even the least bit suspenseful on either front. Things just happen with no build up and very little payoff. We do not even see the main heroes for most of the story and they are written so uncharacteristically that we are almost glad for that! Booster Gold and Skeets could be a really interesting duo to follow, but Booster's dialog is not snappy enough to give him the edge the actor is trying for. The love interest is shallow as well, barely developed enough to feel natural. It is also hard to make inanimate disasters compelling since it has no personality to attach to and it is either something that cannot realistically be stopped or can be stop too easily with a convenient plot detail. All these complaints are mostly under the one criticism I have for the entirety of Justice League Unlimited: too much stuff in too little time. Half an hour is not enough time to try and do the same level of plot development with over fifty or something new characters thrown into the mix. It gives us little incentive to care!
It is animated just as well as any of the Bruce Timm cartoons, the voice actors are clearly trying to make the material work and there is so much potential to expand on. Sadly, like the whole show, this episode plays it too safe and cannot carry enough momentum to keep our attention for long. Plus, it makes our favorite heroes look like unjustified jerks and we should never feel that way about Batman or any of them.