Alrighty. Here's my current thoughts on things:

First, I disagree with Emz. Immunity is bad on vanillagers to have for the whole game, but it can be EXTREMELY useful to check the infector. Without immunity, two infectors could wreak havoc on the game. Honestly, without the addition of the two free rounds of Immunity, I would be calling OP on the sheer amount of poison the mafia can pump out.

Normal villagers should strongly consider keeping immunity for the first round or two. I won't try to tell you that keeping it is hands down better, because that really depends on how you value the two. It's just a matter of how much you're willing to trade the potential for the cop to get a bad peek VS the potential for the mafia to poison you. Plus, since Immunity IS actually good on PRs and Mafia, a Don peeking you really has no idea who you are, thus denying some information to the mafia as well.

So, now that's out of the way...

Politician: Meh. I don't want to recommend that a villager pick this up, but with the sheer amount of voting block the mafia comprise (especially with Con Man, and multiple base powers), it's probably wise to have someone take this... we could get pretty screwed late game if we can't comprise a decent voting block.

Soothsayer: Don't take this, in general. Exception: you're the cop, or you think there's a particularly high chance you will get killed early (and want to continue to help the village out).

Poison: Pretty useful to have for a normal villager. Gives us a chance to fight a mafia team who specs into lynch control, as the vig alone probably isn't enough to deal with that.

Brutal: Again, if you're not the Cop, don't take this. The chances of knowing who a mafia is when you die is going to be low. The chance of knowing a mafia who's not going to die to crap the next round is even lower. Cop has an outside chance of knowing stuff, but there's still probably better options to help him survive.

Immunity: Great on literally every PR. I mean, who doesn't like roleblock and poison immunity? Especially great on cop since he doesn't need to worry about screwing his own peek over. In fact, Immunity is my top choice for cop.

Fortitude: Situational. I don't know how I feel about it. There's two mafia shots to worry about, but it doesn't stop hitman or infector.

Spiritborne: We shouldn't have more than one. That said, very useful since I don't recommend the cop to have Soothsayer.

Blast Shield: One of the most useful things I can imagine for normal villagers. Utility and protection.

Vote Savant: Great for a couple normal villagers to have. Second best things I can imagine after Blast Shield.

Insight: Also useful to have one or two of in the village. Seems a little less useful to me since there are just flat out SO MANY MAFIA in the game. It is, however, info and info is always welcome.

Hinder: Now here's an interesting choice. Gotta be careful with it, but a three shot roleblock is VERY interesting, especially to a normal villager who can keep Immunity for a couple rounds while he figures out who to use it on.

Overall, this game seems quite balanced. You can't screw yourself too bad with any choice, though some do obviously make more sense on certain roles than others.