The main shortcoming with SH5 these days is the lack of u-boat types. The effort to expand crew interaction and the ability to walk through the boat left them without enough time to create other boats. There are also a limited number of merchant types to attack. That said, there are a lot of players willing to live with that and like SH5 best of all. Considering the low price it's certainly worth a try.
Welcome aboard.
Also, if you want to tell more about yourself, we have this thread:
http://www.subsim.com/radioroom/showthread.php?t=87423