Board Thread:Questions and Answers/@comment-4440927-20141202201501/@comment-24770490-20141202205647

The problem is not the evolutionary function itself, I personally dislike the implementation. The idea is really good, the explanation how it's done is ever better but when it comes to what we see in the series it's just mediocre at best. I would like to go through them first one-by-one, maybe it's easier to express my opinion then.
 * Ultimate Humungousaur: Please note that I say this as a big hater of Humungousaur. The design is better but when it comes to powers, he only got missile hands and "more strength". He was used a lot but in my opinion, it wasn't the right alien to be used that much.
 * Ultimate Swampfire: It looks cool, it has cool powers, it just wasn1t used as much as anyone expected and couldn't live up for the hype.
 * Ultimate Spidermonkey: It looks good, it didn't get much new powers aside from the spider legs but the powers he already had went sky high.
 * Ultimate Big Chill: Just a recolor and extra flame patterns. He breaths fiery plasma that becomes ice. According to the staff, he can fly faster and is ice burns. Probably the laziest one.
 * Ultimate Cannonbolt: No. He just looks like he absorbed steel like Kevin. Interestingly, when he rolls up, he has a lot more sharper spikes and can go just as fast as before. This one definitely needed more work and this was realized by the creators too.
 * Ultimate Echo Echo: Really good, they made him wicked powerful. Luckily, he was shown enough to showcase his destructive powers.
 * Ultimate Wildmutt: How is speaking English makes you better at combat? He wouldn't be bad for a naked, adult Vulpimancer but for an ultimate... They also got rid of Wildmutt's black lips just so they could add more differences. This one is lazy and it's not like there weren't any better concept arts. They chose this, because it was the easiest to animate (this applies to a lot of other redesigns and ultimates).
 * Ultimate Way Big: They simplified Way Big's design so much that even the ultimate looked liked the storyboard version of the original design. Terrible.

So, the overall problem is just the wasted potential, lack of creativity and lazy animators.

Fusions, on the other hand, either end up being useless when you combine the two worst possible aliens or could end up being something wicked powerful. Combining the best parts of two aliens' design most of the time creates an amazing creature with simultaneous powers that help out each other.

To sum it up, they are equally good concepts but the ultimates were overhyped for nothing, really. I have to add that coming up with good fusions needs almost no creativity, since you have everything done, you just need to combine the best parts while for an ultimate, you need to come up with a good design that; makes sense, looks cool, not just a recolor in an armor and has new, unique powers. But at the end of the day, the people who created the ultimates had "coming up with cool ideas" as a job and they were lazy at work.