To be honest, I think Turnberry is only marginally better than Troon. Both work well as open venues, but aren't really my bag. Having said that, because of its beauty and the lovely hotel I would be willing to go back to Turnberry at some point.
In a strange way Turnberry starts off a bit like Troon in that the opening holes are a bit mundane, but probably better as a set than Troon's first 3. For me, the course kicks off on #4 and the stretch thru 10 has a load of wonderful golf - #8 being the star of the bunch. Unfortunately, the remainder of the course can't live up to the high standard set earlier, but it isn't really reasonable to expect it to do so. Like the opening three, none of the holes coming back are poor, but none would be missed if replaced. Having said that, I do like #s 16 & 17, but they aren't outstanding - just good, fun golf.
Ciao