We'll agree to disagree on that one, I think, which is perfectly reasonable given that different solvers like different types of clues, and there are puzzles out there to cater for all tastes.
What you see as fun I see as laziness on the part of the setter, using a rebus (an inaccurate one at that) instead of a cryptic clue, and providing no secondary means of verifying the solution. One could equally, I guess, use:
"Cam?" for APPLE TURNOVER
"MAC?" for HAMBURGER
"Cma?" for PLASTIC MAC
"Mac?" for CAME UP SHORT
"Cam?" for TURNCOAT