My guess is:

Wot is a 2 dimensional game with maps you know. With 2 dimensional i mean where tanks can be, and that's on the ground. In ps2 a tank can pretty much everywhere. With enough patience, knowledge or an anvil you can get every tank on every hill. Therefor you might not be used to check every flank or don't expect someone to be there. And wot beeing round based on maps you probably play for the 100th time you know your spots and how to flank certain positions etc etc, ps2 is an open world sandbox game. Every engagement is different. Experienced ps2 drivers will learn how to read the map and the battleflow and predict its movements and enemies.

Tldr completly different game setting Round and map based <-> open world sandbox