I had him in a 4321 with Menez and Lavezzi on his sides. I had more goals from Lavezzi than I did from Ibra. Maybe he needed a striker partner. I did swap every now and then to 41212. But Ibra just never seemed to be in a decent position to ever get a strike or poach.
I have him there in that formation and he is fantastic.
Does he score all the time, no, he is a medium/low player with 77 pace flanked by 2 85+ pace high/low players who are always going to be further up the pitch,me specially if you are someone who rushes, if you take your time and build up the attacks, he will be an amazing asset for you.
With him being lower pace you can't just treat him like Reus and chip through ball on for him to run on to and whizz past all defenders at ease.
Also don't forget 4321 striker is almost a false 9 CF, Ibra plays that role to a tee, as does Suarez, treat Ibra like he is going to float around the middle of the opponents half,waiting for the time to move up, similar to how he does when he plays for Sweden, and I think you'd enjoy him a lot more.
Maybe you just don't have the play style that suits him, not everyone likes everyone, and a price tag doesn't mean he will be 'for you'.