I am working on one since it shouldn't be very hard to make one.

It stores the ratings in a separate INI file on the server, together with a detailed history about each player's individual vote.

The players will also get their last rating displayed and are free to change it, if the admin prefers to give each player just a single vote rather than giving those more votes who happen to be on the server when that map was played. (Since the system uses the player's unique hash ID, it won't count votes of demo-key players, though. But I won't bother about that.)

Anyway, the system is also trying to keep track of what I consider a "rage vote", means it counts how many of the "bad" ratings for a map were made by players who lost that match in compare to the overall number of bad rates. So if the "rage vote" percentage is a lot higher than 50%, that basically means that the winning team usually doesn't think that the map is bad and that most votes for "bad" came from people who might have been frustrated about losing the map again.

It also allows players who give a "bad" rating to further specify the reason for their vote, so mappers can get better feedback about what to improve. And here I need some help, more concretely punch lines about stuff that could go wrong in a map:
-long walk ways
-too much spam
-stalemates
-lack of weapons
-ugly design
-not many tactical possibilities
-bad linksetup
-comeback too hard
-sides are not even
-???

Very nice idea ! Cannot wait to see it.

- low fps

This is exactly what we need! I agree with kenny, very nice idea Crusha

- bad choice of vehicules

- too many erotic posters on walls

salko wrote:
- too many erotic posters on walls

I think the real reason that puts you off ONS-Stripclub is the ugly red carpet.

What we need exactly are the obliging mappers for tweaking the maps and money for server upgrade. Nice idea anyway. Would you edit the current voting window?

Nope, the whole thing is supposed to be done in a more user friendly way (and it's easier to just script a simple HUDOverlay instead of messing with the existing GUI).
At the end of the match should a small semi-translucent frame pop up on the left of the screen, saying something like "Please rate this map to help us improving our map rotation" and then giving a bunch of (configurable) rating options.
Currently those options are simply:
1. Excellent
2. Very Good
3. Good
4. Fair
5. Bad
6. Awful

Below that does it show the average rating of the map and the last rating that the player gave it.

If he chooses option 5 or 6, another page will pop up where the player can choose a reason for why he rated the map bad.
The menu will be navigated with the F1-F12 keys in order to prevent interrupting the player from the current game (there will also be an option to perform the rating poll after X minutes in the match instead of waiting for it's end, but then the "rage votes" will not be counted).