I play it on a nightly basis with 3-5 of my friends on Mumble. It's quite fun. I would never make the mistake of playing it alone.
Also, there is no way you can adjust to the game in just a weekend unless you have someone coaching you.
From what I experienced last free weekend this isn't true at all. I started playing as a level 1 character in deathmatch and was regularly defeating players who were the highest level and had prestiged. I even got complimented over the microphone by some guy because I was killing everybody with the default weapons. I'm not a good FPS player by any means, but the games skill ceiling appeared to be extremely low compared to something like Tribes or Counter-Strike.