I now offer my animadversions:
1. Love the sub. A lot actually. I've been a sub "guy" since before Silent Service on the Apple II and little has changed since. So, yeah, toy factor of the sub itself is pretty high. I had none of the assembly problems others have experienced, but I am never (OK, well, never may be a bit much but you take my point) breaking it down. It's a display piece now.
2. The resin bits -- the extra ones -- are fun, but wildly unnecessary. One, in fact, is most often in the way.
3. As a game, it's a heavy-ish worker-placement Euro with a well-done war theme. No way it's a wargame.
4. Contra my own words, it reminds me most of some of the weird games Paddy Griffiths dreamt up to engage his peers and students in which they played at being [INSERT THING] and he described what they were doing in real time and they had to react. It is a most unusual experience. The craziest bit so far has been realizing that the periscope, spotting binos, and TDCs are not scrolled in a traditional way when in FPV, but physically turned. This has lead to numerous amusing moments with my son, playing the first officer, spinning around in his chair to spot the ship we're looking for. Or, if you insist, it's a Kriegsspiel simulation with the app as umpire.
5. There is a HUGE amount of granular resource allocation. Perhaps, not yet certain, too much. To do even routine things requires a certain number of men with a certain number of skills to be in a particular place. This requires a SHEDLOAD of planning. Taking the simplest example, turning the sub 10-degrees to starboard, accelerating to flank speed, speed, and then making only two more course adjustments, will wipe out your "regular" actions for your navigational specialists for an entire four-hour watch. Those of us used to noodling the steering, depth, and speed as we go are in for a very rude shock. As I say, I'm not certain, but it may be a bit too much.
6. The random event system is fun if frustrating in the heat of battle. Nothing quite like being told your toilet is plugged in section #3 and you've got to put a crew on it to fix it and surface the boat to deal with a toxic gas problem.
Sticking to milk runs and low difficulty at the moment, but the family is enjoying it so far.