Don't forget that SH3 and SH4 had serious initial problems which were largely (certainly not all of them!) fixed after patching.
Neal is probably working on one of his well-considered, well-written reviews and waiting to see if any patch activity in the first month dramatically changes his assessment.
Think of it this way... if Subsim rushes to print with a "SH5 SUCKS!" review, it hurts the submarine simulation market by turning potential players away. We'll see down the stretch what happens with SH5, DRM, and UbiSoft... be patient.