Just to second the statement - avoid All inclusives in Aruba. Half of the fun of the island is all the wonderful restaurants.
In my opinion (and a lot of "long timers" and locals) - the RUI is out of place. It is a large complex, and really stands out. The Marriot is large, but doesn't tower over everything around it. The RUI has a "minaret" style to it, not a carribean style. That said, the resort itself it very lovely - high end pool and beach setup.
Be careful of the the "old timeshare" section - word is they are doing nothing to it and want the owners to sell out so they can build more resort area on the space (strictly rumor - I have no links, or publications to quote -just 10 years of visiting the Isalnd for a month at a time)