Well I just finished the game last night. One thing I will say about it is that it is pretty fun. I played the "Experienced" difficulty, which is like the middle-road/Normal difficulty.
The dialog was pretty good and it is almost like you are watching a Ghostbusters 3 a couple of years later. Bill Murray's Peter Venkman doesn't really sound the same however. Its hard to explain, but given that its 20 years later, I suppose we can forgive it. Winston seems to have gotten a little more cynical, but that's alright because he's apparently earned his doctorate now as well. I don't understand the calling you "Recruit" instead of using a name. They explain it of course, but its not like you get to pick your name and they do show you in cutscenes. So if it were for immersion purposes, then you should have never seen your in-game self. If it is because they wanted to leave whether they have a new guy in the next movie or not then it seemed kind of silly of whether you still get a name or not, because either way the character is memorial.
Music was alright sometimes, mediocre at others. I never once heard the Ghostbuster's theme song believe it or not.
The good news is that you won't be paying attention to the music anyway. There's just so much action that you are rarely standing there doing nothing. The only time it gets slow is if you search for the cursed and ghostly artifacts with your PK meter.
For strategy and tactics the game does this well. The AI sucks, but its alright, because you don't need to execute complicated tactics to bring down ghosts. You get to revive each other a la Gears of War and deciding whether to let a ghost go and revive some others or not is as complicated as it gets. Every ghost has a weakness and some must be trapped and others must be killed. You must scan them with your PK meter to get their weakness and other statistics. You have 4 different kinds of weapons, each with an alternate fire. One of them even slows down ghosts (and can stop them completely for a short while), while its primary fire is a shotgun-like (birdshot-like really) blast.
Another part of the strategy is that you make money from getting rid of the ghosts. You also rack up "points" for damaging virtually anything in the form of cost of whatever object you destroyed. You can easily cause tens of thousands of dollars in damages if you wanted too just about anywhere. It doesn't count against you (apparently the city has taken out insurance on you), but the more you cause the higher it goes in your Career Stats.
Graphics are fine, not great, not horrible. I like the beam effects from the weapons and the packs that they wear have a lot of detail paid to them. As said above nearly everything that can be expected to be is destructible (just objects like cars, plant vases, desks, etc. etc.). My only complaint is at the final boss my computer would stutter sometimes. I'm not sure why either.
Multiplayer is not available for the PC version. I guess the consoles got a pretty good multiplayer experience, where the PC version got zip.
On an interesting note after unlocking the Art Concepts it looks like maybe the Wii actually has what some of the ghosts and stuff were supposed to look like. The PC and other consoles take Ghostbusters very seriously (though the script doesn't of course) while it looks as if the Wii doesn't. Which is probably how it is supposed to be.
Anyway, its replayable, as much as a movie is I suppose. For the PC it looks to be intended on being played through once, because I don't think you can even have more than one Career going at once.
I'd say that the game is worth playing if you want something different, but still want some fun and action. I think that it'd probably be the most fun using a controller, though if you are stuck with a Keyboard and Mouse GB still uses them very well. It is a must if you are a Ghostbusters fan too.