Not just AP needing a change, the whole marine DLC is pretty much junk. I really can't believe this faction design made it thru playtest to release. The vanguard light cruiser is a joke. It has the same broadside as an escort. It can't strip a shield to save it's live and it can't survive more than one run a boarding distance because of low health and shield, all for the price of an actual useful ship like the hellbringer class. One on one an unupgraded carrier hellbring will wipe the floor with a vanguard.
Strike cruisers follow the stats of table top pretty well, unfortunately this isn't table top! (if it were, I'd be a happy camper, no more junk like bombs and crits wouldn't actually dominate the game) We're talking something with similar stats to a dauntless, with less dps in game, for the price of a lunar or slaughter. Either ship will blow a SC out of the sky no problem. Not what I call balance....
There are no actual cruiser slots or battlecruiser slots. Look at what was done with eldar, chaos and orks. Devs actually created ship designs to fill in the holes in their rosters, and pretty successfully too. Heck even this last patch had even more options released for the eldar. Did the devs get lazy or time crunched when it came time to create the SM line up? The shoe horning of ships into classes the don't belong in just does not work!
The only ship that's even close to being done correctly is the battlebarge, but whoops, that was pointed too high by 4 and 9 points so it can't be used in 2v2! Granted SM can have 2 BB's on the roster, and 2 would be used because they are the only ships that don't die when someone looks at them funny. Also you're stuck having to grind thru 6 levels with sub par ships until you have something that's even close to being useful.
Also the design idea of most of the dps for SM to come from boarding is uninspired and not fun to play. Instead of being a faction that could get close, have gunfire and boarding, we have a faction that has to sit back, kite and launch wave after wave of boarding torps. It's boring as crap to play and frustrating to play against.
Really for the work and promise that went into the original release and factions, the SM's are poor bloody work.