I'm not sure how I feel about the campfest that is BF3 just yet. I'm giving it an honest go, but I want to get some more weapons. What is the best game type to level up in or are they all mostly the same?
The best game modes to level up in would be Conquest and Rush.
The reason these two are the best are because they contain objectives that are worth a lot of points.
The fastest is probably conquest as capturing a point (including neutralizing the point first) will net you 450 points (350 for assisting a capture) and there are many many points to cap per round. In addition, if you kill anyone while inside a flag's area of influence, you'll gain an extra 30 points per kill.
Rush is the second best as you can also get 600 points per objective (100 for arming, 500 for destroying. Only 200 for defusing) played, but they're aren't as many, and it's harder to get defends etc.
I would say go with Conquest. You can get +200 (+150 for assist) for neutralizing a flag, and +250 (+200 for assist) for capping a flag. In addition to the normal fighting points, and squad order points you would get. Over a long game - especially a hotly contested one you can get a good deal of point by going flag to flag.
Conquest will reward you the most XP if you play the objective. If you can handle your gun well, you should try Team Deathmatch. In TDM, all the maps are cut off to a smaller area and every round is under 15 minutes. Also, if you are going for service stars for your gun, TDM is the best option as the matches are oriented on infantry combat. However, since you wish to unlock more guns, that would require you to level up your class. Conquest would be the best for gaining XP for your classes.
This deviates from the question a bit, but if you like playing medic I've found picking a 64 player server with the Metro map is a great way to level up. You can get 500 XP or more just from the choke points by the esculators, per death.
TDM is the best, since there is a lot of action, and it is easier to get kills, not to mention the fact that there are so many players on Battlefield 3 now, that you cannot capture a flag.
TDM indeed is the best. Take a small CC map like Noshar Canals in TDM and just zigzag through the containers and kill. 32 vs 32 man 1000 ppm cant be achieved with other gamemodes, capping flags for points is for noobs. Just fckn kill.
i would actully suggest noshahr canal with extended tickets back to back! i usually rack up over 7 thousand points even when not in the top three positions :D hope this helped
Noshar Canals by far is the best map for XP. It's fast paced, instant kills and there are plenty of ribbons to be won. The only bad thing is the shortened time in which you can revive someone :(