Is Evolutionary Psychology a Good Explanation?

Is evolutionary psychology a good explanation for our behavior? Does it miss out on things as well, like simply non-explanatory knowledge would say? Human beings are so starkly different to every other organism that exists. A human being has an open-ended list of behaviors to which they can continue to add or without bound. An animal isn't reflecting upon whether or not it should do a particular thing. An animal simply does a particular thing based upon instinct.