That's a question only you can answer, really, but since you asked....
I've been critical of SH4 of late and I believe with good reason. However, having said that, I've also maintained on these boards time and again that when SH4 is fixed up it will likely outshine SH3 and set a new benchmark for submarine sims.
So, yeah, I think you should upgrade to play this game. Just be patient, though, and wait for the patches....
