First of all, I'd like to say; you have to keep in mind that at the moment this is a BETA. Expect it to be buggy, and glitchy at points, especially considering the download is only just over 1GB. You can't rate it down for those things considering it's to be expected in a BETA.
Now on to the actual game itself. Clearly, people are going to keep comparing it to Call of Duty, and I don't blame them.. CoD is one of the most popular FPS out there. However, you have to approach this game with a different mindset to CoD. The first matches I played on this were terrible, until I realised why. I was just running in, guns blazing. But to succeed you have to think tactically. You have to approach and flank your opponents, wait to strike. You have to stay low and anticipate your enemies movements.
The gameplay is fluid, with vaulting sequences for jumping walls and animations for knifing other players. It's much more realistic than most in it's league, with about 4 or 5 rounds being enough to put down an opponent. No killstreaks, in my opinion, makes the game more balanced.. I haven't missed them at all. In fact, I didn't even notice they weren't there till a friend pointed it out. The best thing about this game is you actually feel like you're part of a team. Even when you don't have a mic, you have a sense of unity with your squad. You can mark out enemies, and set objectives. Squad members can use you as a spawn point, and you various classes help one another with ammo, repairs and healing.
The graphics are bright and beautiful, and I expect them to be even better in the full game. The matchmaking is almost instantaneous, and you actually feel like your character has some weight to it. Bullet's are affected by gravity, so aim higher than your target if you're trying a long shot. Sniper's are easier to pick out with the glint on their scope. This genuinely feels much more like a Battlefield. The map's are huge. Grenades and RPG's are much more balanced in this than they are in other FPS's *coughs* Call of Duty *coughs*.
In my opinion, Call of Duty should move aside. Battlefield's about to blow it out of the water.