Ahhhh yes, I know what you mean.
I find it very difficult to work on pieces that I do not like or enjoy at all. I think this is true for most of people...
That said, there are different degrees of liking something (from "love it!" to "it's ok" to "hate it!"). I don't expect to love every piece, but I try to give a fair attempt at anything my teacher assigns... if I end up really hating it after that (it's happened!) - I'll let him know and we move on...
Trying to play something you hate is usually counter-productive, you don't enjoy, so you don't put as much effort or time into the practice, so it doesn't get better, so you are stuck with it another week... and so on. It's much better to let your teacher know, and find something you do enjoy and can learn from!
As far as how to still get something out of a piece that you've played 150 times
--- I try to get very focused on little things I want to work on. Have you worked on the dynamics (loud versus soft sections)? Any articulations (accents, staccato, etc)? Has your teacher asked you to focus on any technical aspects (I'm working on not bouncing my wrist with the beat on a certain song, for example). If you like the piece, have you tried memorizing it, and then really listening to how it sounds when you play?
For me, finding little details to try to "perfect" helps me stay interested beyond the phase of, "ok, I can play all the notes, what's next!?"
Also, if you're up to it - you could start looking at how it's put together... what does the melody do, how does it move, do you know enough to start identifying chords and their functions?
Just some random thoughts... hope they help!