I had been looking forward to SH4 for a long time since I had good memories of SH1 and I have always been a PTO fanboy, but when I first saw all the negative posts, I seriously thought of not buying the game.
So far however, I am very happy, I have noticed a lot of improvements over SH3, both graphically and under the hood. The devs have done their homework, all the important stuff is in. Sure there are a few bugs and historical errors, but I'm certain the devs/modders will fix that, after all Sh3 was more or less in the same state just after release.
The game is stable, works well and I'm having fun, what else matters.
