I want a mix of FPS and strategy on a grand scale- such as this:
You have to balance missions and technology- for instance, let's say you're at an early mission in the game. You need to scout, disable the power, then strike coordinatedly on a single target before fleeing. Your target should be the only one to see you and not be able to tell anyone that after you're done.
Before this mission, you've done research. You've spent funds in various areas, such as the weapons, armor, equipment, and training of your operatives, as well as infil, exfil, pre-mission intelligence, and tools to use during a mission. You've also bought various assets that you have to keep track of- if you buy a carrier to launch air vehicles from, it's also your job to place it before missions and put it out of harm's way in the mean-time.
So then. You've managed to get yourself a small strike force of VFM Harpies (VTOL jets, capable of hovering to provide stable close air support) and borrow a nearby carrier to launch them from. Thanks to research and manufacturing, you've outfitted your four-man team with equipment such as advanced octorotor drones (quadrotor, 2x2. Capable of flips.) and silent breaching equipment. They have semiactive camo which mimics colors, and they're loaded out with silenced weapons of choice. Before the mission, you used a stealth satellite to take pictures of the compound, allowing you to mark areas of interest.
As for infil, you've chosen the expensive option of a HALO dragchute. The stealthiest option at the time, it involves a regular HALO jump, but the parachutes are activated earlier. They don't fully balloon until a certain speed is reached, ensuring safe landing, while sacrificing little in the way of stealth.
The mission starts. You are outside the compound walls. You order everyone to hold back, and take control of a character with the octorotor drone. Sending it up, you fly above surveillance and scout the area firsthand. Marking waypoints, you make your way to the power supply with the drone and fly it close to a vital area of the machine before detonating the drone, causing a power outage.
You order your team to start moving along the waypoints. Still in "quiet" mode, everyone avoids engagements. Not a problem, since the power is out and everyone is more worried about that than the four shadows that flicker by.
Reaching your target after taking out a few troublemakers quietly, you breach the small hangar and reveal a plot point as well as a warning- the enemy has a Big Weapon, and probably many more. You have a choice appear. Put a tracker on it, track and sabotage, or place a beacon and send the VFM Harpies to destroy it?
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In an almost X-Com like system, gameplay is half management of research and arming your team and half strategy- though, in this case, it's real time. Online would offer co-op where four or five players (each outfitting themselves based on who's in charge and what they have) allowing strategy beyond what the AI is set to handle.
You will have to keep up with your enemies, especially in certain missions set to allow the enemy AI a range of options. Say a low-rank enemy sees you. Chances are he'll shout and a gunfight will break out, but he could also silently go and set off an alarm. Either way could alert a high-ranking officer, and they could very well have something up their sleeve you aren't going to like- such as attack helicopters, drones, and any number of things out to kill you.
The game has a stealth bend but stealth is not the only way to play. Sort of like GR:FS's campaign.