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One of the basic tenents of evolution is that there is no goal or point to it. It isn't directed at making better species and it doesn't mean that species that survived are better. All it means is that something changed and that change didn't favor them.
We didn't evolve to walk upright. There was a geneitc mutation that led to speciation where some walked upright and some did not. Fish in the water DID get lucky and a mutation occurred that allowed them to breathe air and water and further mutation led some to lose the ability to breathe water. And, yes, monkeys were just random animals that could climb trees.
I want to know what biology/evolution book you are reading that led you to believe that the theory of evolution is directed by some goal or is headed to some end to make the best species possible. The giraffe didn't suddenly realize that eating plants in high trees would be a good idea and decide to grow a long neck. What causes evolution is completely random mutation and small amounts of environmental change. Genetic mutations occur, most are bad and the animals that get them die, some are benign and go on, and some are advantageous which gives the bearers an advantage over the previous specices from which it derived and the old dies out. Also through generations of breeding the mutations become so great and different that cross breeding is no long possible.
If this is honestly not the way you understand evolution and you learned it was a continual process leading to greater complexity and perfection then I encourage you to go to google and look up Charles Darwin and Jean Bapitiste Lamarck. Lamarck proposed the directed concept of evolution which is a very common misconception and the scientific community smacked him down and claimed Darwin's random evolution the only one that really made sense.
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"The courts that first rode the warhorse of virtual representation into battle on the res judicata front invested their steed with near-magical properties." ~27 F.3d 751
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