Being a new player in WoWs I find the PVE mode very handy, yes it may not give me as many credits but I can learn tactics, figure out the gun handling of different types of ships (i really suck at US DD's at the moment and trying to get those torpedoes on target.... pve is great for me to get my practice in).
At the moment I have not gone in for a PvP game, I want to go in prepared and have a good understanding of the tactics, ships, roles and controls, ok you will have 90+% who will just dive straight in to the pvp game and get their back sides handed to them, but that is their problem not mine, its there so im abusing it for now