This will be controversial but Hitman blood money.
I have put hundreds of hours into the Hitman trilogy, but no matter what I can't get past the first guard of blood money, that is if I can get past the clunkynes to even get to him in the first place.
I would like to try it as I have heard a lot of good about it, big portion of the fan base think it is the best game ever, but no matter how many time I trow that god dame coin the guard refuses to move and I can't progress and that combined with general age and clunkynes of the controls don't make it an enjoyable experience to try.
In the trilogy and Absultion if I got stuck it was at least enjoyable trying to get around it, this is just frustrating.