Gold spam
Credit grind
OP Premiums
Loot boxes, premium time and other predatory aspects
Matchmaking issues (3 arty, team balancing, plus 2 minus 2 is awful)
All of these issues make the game playable at best. Would not recommend wasting time on WoT as a new player, as you will find it frustrating and hard to grind.
The only good thing it has going for it is the graphics and mechanics.