Yep! You now have to go searching to find a post someone left on your fanpage and because they will always be less popular then a post that you put up yourself since it will get more views it puts comments from your valued fans way down the page where people will never be looking.
Lets say someone asks a question about your product or company or posts a picture etc. You will still receive the email alert about the post but when you go to your fanpage it seems like it is missing. You might have to scroll down several days worth of other posts to find it and being so far down your page there is not much of a chance that other fans will see that post either.
Yes its nice to be able to see popular wall posts but people who visit your fan page will easily be able to find them there is no need for them to appear first. Facebook needs to being back chronological order for fanpage walls. Oh and while they are at it they need to bring back the tabs it was so much easier to find things that way. Plus for the bigger companies they could create splash pages or direct visitors to their contests etc. Now you have to know to look under the companies logo (avatar) and figure find the page you are looking for that way. This system also makes no sense its like burying the lead in a story or hiding content that should be front and center.