Although this is a basically dead thread I might as well post an overall statistic from what people mentioned in here. With the map pool still being almost the same this is still relevant anyway. First the 4 most liked maps, not really a surprise to most I recon. There are the amount of votes and the order that people placed them in. This wont be 100% accurate due to scraping and optimizing that was done to not make this take ages.
The numbers at the bottom represent the place they were in the list, so number one is the first item on the list.

http://i.imgur.com/BhUJ75v.png

There is already quite a big jump between Product and the other 3 but even so it managed to get into the 4th place spot.
Next up is the bottom 5 maps. I will mention that while most maps got around 130 votes Reckoner only got 41 and Metalworks around 110.

http://i.imgur.com/4VT8PEA.png

Badlands still has an overall decent scoring but has a score that is all over the place and slightly hangs towards the lower areas. The Reckoner bars being exceptionally low due to the amount of votes but averaging around 6.5 and metalworks with the lowest score averaging around 6.7. Granary also averages around 6.5 but there seems to be a trend that it is the 9th placed map on the listing.

Here is an overview as pie chart with which map gets disliked the most. The calculation that was used to achieve this was: amount of time on placement*placement # for every placement and then the sum divided by the amount of times the map was listed. If there is interest I can make a split up version for both EU and NA but currently don't have the time to finish it in this sitting alone.

http://i.imgur.com/Ka14DQB.png

The final listing is:
Snakewater - 2.907
Process - 2.930
Gullywash - 3.231
Product - 4.008
Badlands - 4.882
Sunshine - 5.219
Reckoner - 6.537
Granary - 6.553
Metalworks - 6.728

This was my first time doing this type of info post so if there is any feedback in regards to that feel free to leave it.

Edit. My cursor was apparently in some of the charts

granary and reckoner are equally disliked, any plans to replace at least one of them in ETF2L? say, after a new map cup for example

delete badlands now

^this please

delete reckoner and give us cardinal mby?

can we just delete anything with lands or anary in the name

granary has more chokes than me and my bird on a Friday night

viaduct
process
snakewater
gullywash
sunshine
metalworks
badlands
granary

procces
gully
snake
product
sunshine
granary
metalworks
badlands

people who dislike Granary and Badlands EleGiggle

snakewater
sunshine
gullywash
product
process
metalworks
granary
badlands

Snakewater
Sunshine
Viaduct
Gullywash
Process
Badlands
Metalworks
Granary

Replace Metalworks with literally anything. It has been the worst map in the pool for around 2 years now. Everything else is fine.

Metal >>>> granary and blands i m o

granary is a very early map in tf2 development, just a flat map with a bunch of "rooms" like cp_well
badlands is a masterpiece
dont put these two on the same category

bagel

badlands and granary have been in the map rotation since the dawn of time and they are clearly outdated and possess major flaws and that has been apparent for some time with the attempts to make pro versions of the maps that have not really improved the game play, plenty of reason to exclude these from the map list. Even iconic maps in other games (dust2 for example) can't stand the test the time with ever shifting metas, eventually they all need a massive overhaul or need to be rotated out of the map pool.

how's badlands a masterpiece when it's still so difficult to push out of last?

because it's not a masterpiece