Did you miss the last 64 years of research and philosophy? The last hold-outs, save the most delusional, we're knocked out by Searle in 1980.
It's only controversial for those who haven't read Turing's paper, or have completely failed to understand it.
Eliza, for example, highlights the massive failure in Turing's reasoning -- The question "can machines think" is not equivalent to the question "Are there imaginable digital computers which would do well in the imitation game?"
Weisenbaum found the response to his program from non-technical staff disturbing.
Secretaries and nontechnical administrative staff thought the machine was a "real" therapist, and spent hours revealing their personal problems to the program. When Weizenbaum informed his secretary that he, of course, had access to the logs of all the conversations, she reacted with outrage at this invasion of her privacy. Weizenbaum was shocked by this and similar incidents to find that such a simple program could so easily deceive a naive user into revealing personal information.
( From Eliza to A.L.I.C.E. )
Further, the so-called "Turing test" hasn't held still. Not even in his 1950 paper! (Turing proposed multiple variations on the test, if you'll recall.) Since then, a number of different versions of the "Turing test" have appeared, none of which are (like Turing's variations) are equivalent to one another!
If you need a *really* simple argument: The results of any variation of the "Turing test" are completely subjective. Consider a program that fools 100% of one set of interrogators may completely fail to fool even 10% of another set.