Its fairly replayable because you can change strategies, change factions, and change scenarios, however it won't be a hundred hours worth of content unless you just love the strategy.

If you are interested in a new(ish) formula for strategy games you should check out Great War: Western Front. I really enjoyed it and I found the swap between tile based strategy to real time tactical command was really rewarding.

I have started playing a lot more Crusader Kings 3 and Victoria 3 here recently. I have a ton of single player games I should play, but due to school I find I rather spend my time playing other games with a more multi-player focus to them.