Which map packs are worth getting for Battlefield 3?

I'm considering to upgrade to battlefield premium in order to get new maps for the PC version. However I wonder if premium really is the cheapest way. Maybe some of the map pack turned out to be boring or have no players. Personally I hated Back to Karkand expansion because the maps where so big they where impossible to defend and there is almost no action. Then there is Sharqi where the game is basically over when the attackers captures the helispawn. 

These are the map packs that are availible:

* BACK TO KARKAND(included)

* CLOSE QUARTERS

* ARMORED KILL

* AFTERMATH

* END GAME

Price seperatly 149 SEK(149*4=596), premium 499 SEK. I know about the change of country hack.