Summary: Controls are completely different from previous games. I loved every single game that this series has put out except this one. Armored Core 4 series had some slight changes in controls but were easy to learn and master. This game seems to be solely designed to be played in multiplayer on campaigns.
Summary: For fans of mech games like me this is a great game especially now since the Chromehounds servers have been taken down. There is a great level of customisation and the multiplayer is very fun. The campaign is a bit lackluster.
Summary: From Software has a long history of games with an intense learning curve (dark souls and DS2 are the most recent examples of this) and once you get comfortable with the controls in AC3 and 4, the games open up to you like a perfect rose of rewarding, deep, and complex gameplay.
Summary: I have been following the Armored Core series since the first game came out on the Playstation. I through at least a hundred or so hours into the game and enjoyed it. After the first installment, only Nexus and Armored Core 3 were playable to me, until 5 came out.