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Unfortunately, the game is also an amazing silly game, which is what ultimately drove me away from it. Intruder also has a unique voice chat system that is the highlight of the game to me- I've written about it before here. You can also make custom maps, which can be hit or miss but often provide a unique take on the game. Mountainside is huge, with a lot of unique mechanics (mortars, controllable spotlights, a triggerable helicopter attack), and often sees Intruders with a sniper-spotter team on a bridge, keeping the outside of the building clear of guards as the rest of the intruders zipline or climb in. Cliffside is all close-quarters combat, with the guards shutting off the chokepoints until enough people die that one of the choke points open up and it becomes a game of cat and mouse.
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There's a good balance of official maps Riverside and Oceanside have long and short range gunfights, multiple approaches that can't all be watched, and lots of places to hide traps (or yourself).
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In one map, Riverside, you can choose between crawling through bushes on a road, ( hard to see but open to explosives and medium speed), taking the roofs (very quick but a sitting duck if you don't use smoke, which can attract concussion grenades), taking the vents (takes you straight to one of the objectives but takes a long time, and its exits are chokepoints), or several other approaches. Maps have a good variety of routes to the objective, with a good balance of benefits and drawbacks. You get a lot of interesting gadgets, like motion sensors, C4, smoke grenade, tear gas, a camera-on-a-stick.
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I've played it quite a bit, and I can say that the game is an amazing stealth multiplayer game.
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