(Review base on single player) Amazing video and sound presentation, but the story and missions are not very special
First, in term of graphic, AC6 absolutely no doubt gets a 10/10, the planes and scenery are so beautiful, so beaware of getting carried away by enjoy the beautiful view. One of the night mission specially gives one of the most beautiful battlefield in the whole AC series. (I have played Aircombat 22, AC2,3,4,5,0, and 6) The missile tracer and explosion effect are really enjoyable as well.
Sound wise the radio chat is much more serious and professional this time. There are much less random humor chat going on in AC6, whether this is a pro or con will be up to you. The music is again amazing, it gets both amazing electrical and orchestral pieces. Sound effect such as engine roar and explosion are all up to AC series expectation and are absolutely amazing (get a decent subwoofer to enjoy it!)
Gameplay there are both pros and cons. FIrst, to me 90% of the missions feel the same, just bomb the hell out of everything on the map. The addition of Operations doesnt really change the game play, just it divides up each big missions into several small missions. And the addition of checkpoint after the completion of each operation can be a good news to many people. Personally I like more variety of missions they used to have in AC5 and Zero, but again it is up to the people playing it, because I know a lot of people absolutely hate those mission that you have to escort something, or have to fly between radars, so if you like those mission that you can bomb a lot of stuff, you will probably like AC6 much more than any others in the series.
The addition of high-G turn is really cool, but not really that much difference in term of game play. Basically your plane can make tighter turn by trading off a lot airspeed quickly (never try to pull high G turn at low attitude unless you remember to check your airspeed all the time), but you can't really do crazy maneuvers such as Cobra. Your plane can turn tighter, period.
One of the best addition for AC6 is probably the Allies Support, and it is really useful. It is really good to know that your allies are finally really doing something for you. The look of Allies Support is plain awsome, especially when you are in a good position to see zillions of missiles fire at your target.
Story is really nothing that special for AC6, to me it is actually kind of boring... However, what kind of story you can expect from an arcade flying game anyways? In my second play through of the campaign mode, I skip all the cut scenes. (Unlike in AC5 and ACZ I did not skip any single cut scene in all my play throughs.) Also in AC6 the story does not glorify you as much as AC series did before, it makes you more feel like you are part of the whole airforce and not just a one man army.
Difficulty wise it is pretty much the same as before. There are much more targets in a mission and many more enemy will be shooting at you at a time, this somewhat makes the game a bit harder. However,in AC6 all the planes carry more missiles, plus you can call in Allies Support, which is kinda over powered, so the difficulty kind of balance out. Ground target are as easy to kill as before, while the enemy planes are a little bit better at dodging missiles and will require a good firing angle to shoot them down. Overall my conclusion to difficulty is: if insisting not using Allies Support it will be harder than other AC in the series, otherwise it is pretty much the same.
The enemy super weapons and Aces are not very interesting. Aiagon and its sister ships are pretty much another enemy base, just they are flying in the air, nothing special at all. Strigons teams...well they are not bad, just the battle scale are so huge in AC6 and a lot of time Strigon's got shot down by Allies Support without you notice it...so personally I don't feel their presence very significant. The Strigon 1 fight is not that fun and becomes quite frustrating with all the UAVs flying around.
Overall, AC6 is a good game and lives up its name. If people just want to fly some amazingly beautiful plane and shoot a lot of stuff, they will absolutely love AC6. However, if you are expecting a lot of variety in the missions and want a some what good story, you will be a little bit disappointed. Anyways, after all those talk, it is a great game and one of the must buy.