Bunkers are one of my favorite tools and the primary tool I use in my strategy. In single player I think they are well balanced. Cheaper and comes with soldiers, makes sense, a unit that can't move needs some additional perks. In multiplayer though these perks are incredibly powerful as you get the positives without the drawbacks that you get in single player.
In single player you need a mobile fleet to capture cities and defend your own. In multi you just need to fight around a single battle. I think they should stay the way they are in singleplayer but the price cut should be removed or reduced in multiplayer to help with balance. Otherwise I see little reason to use anything else except situational vehicles like bombers and a couple landships to deter flankers.
I will gladly prove my point in battle.
Agree, small bunkers are bit strong. I normally play multiplayer with buildings off because of that.
A while back I suggested multiplayer have an "assault" mode, attacker gets 50% more points, defender gets access to buildings.
I like that idea for a type of game mode. Problem is few people use the same strategy and the mode probably wouldn't be all that popular.