Unfortunately, the site is too rugged for the MER missions. The frequency and size of the blocks would be highly hazardous for the mission. Personally, I think that the remaining sites are ALL absolutely beautiful, well thought-through and would make excellent landing sites. The reason I am particularly happy about Gusev and Gale is somewhat obvious, but it is not only because I have been spending a lot of time studying and publishing about them. The reason is knowledge and what can be learned from such site.
Ancient lakes are time machines.
They are open books left for us to decipher about the evolution of Mars, its cycle and its changes. In craters like Gale and Gusev that are at least 3.5 billion years old, a real Rosetta Stone is waiting for us up there. How much we will learn will depend on how far we can go and how long the mission can last. If life ever appeared on Mars, lakes are certainly among the best places with hydrothermal sites to investigate. It is then important that ancient lakes are included in the first cut of this selection.