Tiers 8-10 seem pretty fun to play for me, then again I do play the DKM CAs.
But yeah I get what you're saying. The missions take a while to get done and the captain doesn't have good universal skills. Though, not to be rude, if you can get Yamamoto you're probably the kind of player who can make best use of those unique skills. Though perhaps having his unique skills benefit the ship as they do, it may encourage more aggressive playstyles? I'd doubt it, but it would be nice to see more people playing aggressive at Tiers 8-10, as I cannot tell you how many Baltimores I've seen camp behind islands with their DDs, smoke CAs, or BB buttbuddies. That's just my two cents though~