I will also respectfully disagree, especially if you compare it to the Taco Bell Mango Strawberry Frutista,
which I find a wonderful refreshing guilty pleasure.
The McD strawberry IMO is an overly thick overly sweet "syrup" underlaying an OK frozen lemonade slush.
If you drink as is it's cloying/unappealing. If you mix in it, it's OK/meh.
The mango/strawberry frustista is a mango slush with soft soft of thawed frozen strawberry syrup/fruit bits
ladeled over the top that sink into the slush.
When you drink it, you get a nice combo of the two, plus the fruit bits.
I like it-like I said-guilty pleasure....
"If you reject the food, ignore the customs, fear the religion and avoid the people, you might better stay home."
~James Michener