Star Trek (2009) had brains and quality in comparison to Enterprise. In fact, what I mean by brains is that there is some kind of admirable thought behind it. In other words, JJ Abram's Star Trek actually had a well thought out plot, descent character development, and an acceptable or proper explanation behind the alternate time line we were given. Now that doesn't mean the film is not flawed in some ways. In fact, every movie has it's weak spots or errors. However, it is still probably the most entertaining and re-watchable Star Trek movie in my opinion, though. And that tells me that there was quite a bit of thought and care that went into this film. It just wasn't slapped together mindlessly like Generations, Insurrection, and Nemesis.
As for Enterprise: Well, it didn't have any brains because there was no thought or care behind the character development, the casting choices, the majority of the story lines, the canonical errors, and the TCW (Temporal Cold War). It was just completely a brainless show in my book. Sure, the creators tried to make improvements in Season 3 and 4. But by then, it was little too late. Plus, there was still a ton of things that needed to be addressed or corrected that went undone, as well.
Side Note:
Oh, and why would the creators need to go to such great lengths in re-writing a show in such drastic ways if it wasn't working from the beginning? I mean they tried the first two seasons with it being a Voyager carbon copy. Strike one. Then they tried the third season by writing story arcs in a 9/11 theme. Strike two. Then they tried to make it a prequel show. Strike three.
Sure, the show was doomed by the network. But if the series had a good cast, and it didn't lose a certain number of the Trek fan base it did from the beginning and it wrote original, intelligent, and inventive story lines in proper consideration or respect to previous Star Trek shows. Then the show might have had a shot at lasting on the network.