They should have stayed true to the veterans and fans of the original Armored Core. Otherwise, it's OK...
Hopefully, the next armored core will go back to it's roots. I love going on missions, making money, and upgrading my mech. In fact, they should have an Armored Core 5, that takes the best of Army of 2, and then combine the genres into a Merc Mech type of game!
Anyhow, I still like Armored Core, but will not play Armored Core 5 if it ends up being just like 4. I'm a bit too old for flash and bash fun, and want something that takes a bit more thinking and building your mech.