there is a lot more thinking involved, and you really have to be able to read suspects and put together the clues to ask the right questions.

but is it open world? Yes.
Go anywhere, take any car? Yes.
signature R* storytelling? Yes.
Map challenges/unlockables? Yes.

But it's way more directed than GTA, and you are on a tighter leash. You can't just rob and stomp people or draw your gun at will and start shooting or anything. A lot of what you can and can't do is contextual.
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"There's a fine line between persistence and foolishness..."
-unknown

"To Each His Reach"
-George Clinton