Agreed, I don't put too much faith in rankings as you'll typically find groups using cheese strategies (such as single tank single healer strats in the current EXes to heavily pad their stats) and parsing at face value should be taken as guideline and not gospel
That's why there's in depth charts and tools that will decipher that information and if I were a raid leader that was asked to review a parse, I'd use the analysis tools as opposed to "oh you're in the top 2000? You're good to go" because that won't paint a proper picture and the devil is in the detail.