I've played the Desura release of RWR for probably at least 100 hours (and most of that's just in single player) and can confidently recommend it to anyone looking for a fun shooter with some very unique qualities. More to the point, I've described this to friends as a combination between Cannon Fodder, General Chaos, and War Hawk. On top of that, the game really gives a sense that you're a tiny soldier in a big war. You won't be able to Rambo your way to victory, but instead will need to work with your team (even if they're just AI) to achieve objectives. Speaking of the AI, it's really good and constantly being improved. I believe the developer even had an interview somewhere about developing the AI. It reacts to situations dynamically and can do almost everything the player can.
All of this comes together in a really fun way. If you like pick up and play shooters but long for something a little more dynamic/deep then this is the game for you. I find myself just enjoying watching the AI soldiers fight and it's satisfying knowing I'm a part of a larger battle. There's really nothing else like this out there.
Edit (as of June10/2014): A player experessed some concern that RWR isn't very similar to Cannon Fodder, so I want to make a note here about my comparisons to other games. Read on.
Cannon Fodder: Cannon Fodder's movement feels "floaty" to me (in an arcady good way), and the mouse aiming, while less precise than RWR's, is similar.
War Hawk: Mostly because RWR is a fairly large-scale multiplayer game, but also because even in singleplayer, as I've mentioned in my review, RWR makes you feel like part of a team. That's something I felt quite strongly in War Hawk as well.
General Chaos: Probably the least warranted comparison, but hey, obviously I like General Chaos and wanted to make some connections. General Chaos has been described by some as an RTS, and certainly it has tactical elements. You control where your soldiers move and then just hold down one button to shoot (which you absolutely do NOT do in RWR) but in commando mode you control one character directly. Again, the movement is similar and there is cover. The battlefield is isometric, so not quite the same perspective, but close.
Net War: I sincerely doubt many people played Net War, but basically it was one of the first online only shooters. It was overhead, had team based modes and there were vehicles. Pretty similar actually, but RWR is better.