Ive just found the start of it really slow. Practise jumping. Right now go here, ok now go there... and the only weapons i have so far are metal poles of one kind or another and my guy can only swing them like 3 times before he gets tired and has to back off.
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I put around 70 hours in and I've still not finished it, I found it more fun just doing side missions for the majority of the game but I advise getting the game to the point you have full day an night cycles, soon as you can wander around at night things get more fun because it becomes a game of stealth rather than killing