well, if you set the list to state the "most reviewed" (meaning the number of people that have reiwed it), it will put the ones on top that have been reviewed by the most people. However, that's by no means a higher rating (as reviews can be praising or a flame-fest), it just means the engine is more well known.
Tourqe is crappy, but it's by far the most famous engine out there. C4 is good, but it's a shame that not to many really know about it. If you want the correct order you're looking for, select sort by "overall rating" and "in descending order".