Combat with enemies able to kill you in 1-2 hits.
Doesn't mean I'll never give it a whirl, just that I don't think blowing £42 on it now is a good idea.
(The more I spend on a game the more I expect from it so, if I wait and give it a go when it hits the £20-25 mark, I probably won't be quite so unforgiving towards it.)
EDIT: Also looks to have a fair bit in common with Tomb Raider, which had bits I loved, but also sections that drove me nuts. Now, that doesn't mean Tomb Raider wasn't a quality game it was, just not for me and I wouldn't say my experience is either transferable or universal.