I'm not worried about being a noticed great player, or I wouldn't have suggested removing the ranking system. I'm already in first place with double the score of second. The point of this though is to keep players from worrying too much about rank and start actually enjoying the server instead of getting all annoyed when stupid stuff happens because of a newer player or a barricade breaker. Sometimes its fun to just run around the map with a couple friends not knowing what might happen, being in a total scenario of discomfort and unknowingly about to be..*cough* Anyway, with rank, people just started to have less fun.
And Zero, I don't really see much wrong with the ranking system. Though if you wanted to keep people from zteleing (or whatever else to avoid being tagged) then I would have to agree that making it so that you don't lose score when dying by a zombie would be a good idea. As for the bonus points, not such a great idea when it impacts score.