I got it for Christmas and I had fun.
But after a few weeks I noticed the following things:
1. The campaigns suck
1.1 You get the same mission over and over
1.2 All merchants are armed
1.3 I know RSRDC fixes that but other things stopped it from making a difference
2. I got really bad mod soup
2.1 The Ohio SSBN changed it so the only available torps are the MK-48(great but inaccurate) and the anti ship missile(which sucked)
3. The U-Boat mission expansion sucked
3.1 You always end up patroling an area for ever
3.2 Ops Monsoon fixed that but the planes could see you when your 500 ft down
4. There's no interior except the conning tower, command room and bridge
All this made it painful to play