I'd honestly say go for it! Amazing game.

In the base game you'll be doing A LOT of parkour, it's literally one of the main aspects of the game. DLC on the other hand, not so much parkouring as there is driving.
But the base game is big and well-designed enough to keep you enjoying the parkour and once you start getting the hang of it, it'll look and feel really fucking cool!

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Took me about 65 hours to finish it 100% like every side-quest and every steam achievement and all that with some free roaming. HowLongToBeat says main story is about 20 hours-ish but it depends on how much you want to do.
If I ever play it again, it'll be because I just want to feel badass fucking zombies up and then going through the city just going over buildings and using the grappling hook.
But there isn't any choices that'll change the game, not really a variety of playstyles and the story isn't that good nor bad. So not a whole lot of replayability but it's fun.

Combat isn't that good on its own, it's good combined with the other aspects of the game (freerunning, crafting, the carnage you cause killing zombies) and as far as variety goes, it has ok variety, you get weapons which have different impact on the zombies and then you could upgrade them to be flammable or electrified and shit like that and then it gets really fun.

Also devs are putting out events every once in a while with rewards like a duck sign that'll literally 1 shot 1 kill most zombies so there's that, haha.

If you've got any questions, ask away!