I also bought this game long time ago, but in Q1'2014 the game was unplayable.
I tried it again half a year ago (only two patches: 0.57 > 0.58) and I play it ever since however I also got some kinda bored as plenty of people left the game.
It seems there there is a handful of players left. In 0.57 there were plenty of full servers. Now there like dozens at most, more often a few servers with 38-40 48-50 players logged in.
No zombies.
No fun killing bambies or bambies with barely decent armament (MP5/CR75).
No fun traveling in cities (massive FPS drop in cities).
Almost no vehicles (V3S) as they are already hidden and no new spawns of them.
Hardly bearable loot distribution system (ridiculous spawn or no spawn).
No bicycles.
Hardly a handful of clothing pieces.
Poor crafting system (very little of items to craft).
You can barely do a hunt for animals - complete randomness of wildlife spawn.
Very very long development life cycle (players tend to be bored as updates took place barely once a quarter).
Early alpha status for almost 2 years.