In fact they tried to enhance the firstly published rules in CJ 6 by an update in CJ 9, but it was still unsufficient.
The main problem is the crew system. There are three types of "wizard". The better wizard you take the more crew you have... which might make sense at first glance but... if you take a Toomb king, which costs 50pts, you can spend more poins on ships, but have not enought crew to man them...If you take Necromancer for 300pts and compulsory Necropolis for 250, you have 450 points left for the rest of your fleet.. Meanwhile Skullhammer squadron, which are small 3 crew ships that even cannot shoot - only ram, costs 250 points. And even then, you can mostly fill the crew slots only with zombies, which are -1 in boarding actions.