Yes 5 stars is the top, but read the conditions as to how each star is awarded before deciding you want to rate the equipment as 5 star as well. Similarly the percentages should be carefully reviewed befor just plumping for the top %.
Look at alternative sources, my Pioneer 436XDE came 11th in Which's review of screens but for 9 months was the best tv in the history of the world in one of the What ... magazines