Ok my thoughts after very few hours.
-Graphically is mediocre, it looks like a computer game. Plastic Gear Solid they should have called itit.
-Less coltrols schemes than Ground Zeroes, disappointing.
-Too many menues, too convoluted.
-Voice acting can be terrible, Troy Barker doesn't get Ocelot right IMO. I miss Zimmermann.
Sutherland is just ok, snake speaks so little anyway.
-The iDroid map is too small when used while moving, in GZ it was bigger and I had no problems, now it's harder to play my way.
-Suppressors that deteriorate are a ridiculous.
-Afghanistan feels empty and insignificant outsude populated areas. To summarize I would say that "cp/outposts are gameplay oasis in a desert of boredom".
-The limited traversal can be annoying and really limits freedom of approach.
-Weapons in first person are not always functional, but is rare.
-Automatic cover is dodgy , sometimes it doesn't work.
-Stupidly there are no lethal cqc moves: Splinter Cell, Dishonored, Thief, basically all stealth games have lethal and non lethal melee so Kojima is behind times.
-We get score reductions for not completing missions in one sitting: whisk tango fox Kojima!
+Great freedom of approach is great. This makes it stand IMO.
+Very short loading times.
BTW I am enjoying it very much despite all its shortcomings.