My impressions so far, with progressing to tier 4-5 in all lines:
Torps as a whole are OP. My destroyer can shrug off large caliber shells if RNG is kind, I can close to ridiculous close range and end a BB in one salvo. I can with ease use my trop bombers to do the same thing (albeit with less punch per torp). I would like to see a minimum arming time so you have a chance to dodge these. Alternately, give the BB's a blister/false hull upgrade for torp defense.
Carriers are boring as sin. More boring than arty in WoT. Also, if in a tier 4 battle, carriers are OP as hell as low tier ships have little to no AA and are not maneuverable. This is something that *needs* to be addressed. Do you have any idea how annoying it is that you can do nothing to the repeated torp bomber strikes while in your slow pre WWI ships.
Cruisers are interesting, but don't have a role. They are not a counter to anything. They can not engage destroyers at range unless the destroyer has no idea how to maneuver. If they close range, then the destroyer is more likely to dodge the crappy torps the cruisers get than the cruisers dodging the plethora of torps from the DD. Cruisers certainly can hurt BBs but can not counter them either. Cruisers are FOOD for BBs.
BBs are all or nothing. Either their AP rounds do a pathetic amount of damage (dun care where a 12 inch shell hits, it is going to damage *something*), or it hits for a crapton. You have to be *constantly* aware of where planes are and manually aiming on them with your guns to shoot down the threats.
Maps: Some of them are ridiculously sized. It can take you many minutes to traverse and by the time you get somewhere, the game could be over. This is highly frustrating when you must choose between a few corridors early on and then find out the enemy is on the other flank.
Capping: Multiple times, due to the maps and scale, I have been in quite a few battles where the areas are capped out while only 1-4 ships are sunk. This makes for a very annoying time. Either you are stuck defending against a horde of ships and dying then they cap, or you are committed to the flank and counter cap.
I think the game is fun, has promise, but needs quite a few things addressed. As is, I see no reason to play anything other than destroyers (which I find the most enjoyment out of). It is exciting to play, has huge rewards when you sink a cap ship, and you have to get in the thick of it. BBs are second, but are kind of boring to sit 20km away and duking it out hoping for a crit before the enemy and keeping the eye on the sky.