I find that one of the best beginner first person shooters to get is Tribes Ascend, made by Hirez. The content of this game is everything that a beginner would be looking for, from tutorials to a help wiki.
This first person shooter has two different types of playing the game — one is obviously in first person, whereas the other option is to view your character from about 2 feet behind (third person). Also the game has several classes from which you can modify and alter to your taste, the classes include, Pathfinder (agile but loud weaponry), Sentinel which consists of a far reach sniper rifle and a pistol, Infiltrator which consists of a silenced machine gun and a silenced pistol and has an ability to become invisible, Soldier which consists of a machine gun and a grenade launcher type of gun, Technician which consists of a repair gun used to repair towers etc. and a small machine gun, Raider which consists of a grenade launcher and a machine gun, Juggernaut which consists of a grenade launcher and a pulse rifle type of gun, Doombringer which consists of a chain gun and a saber launcher and a Brute which also consists of a automatic shotgun and a saber launcher type of gun.
The game has several maps ranging from a grass biome to an arctic region, all of the maps have a set are of which you can play within and there are barriers that stop anyone from passing beyond. There are several gametypes (team deathmatch, arena, capture point, capture the flag) with a handful of well-designed maps, but Tribes is best for Capture the Flag. Using a combination of "skiing" on downslopes and using your jetpack to push yourself up inclines and preserve your momentum, you can pick up some ludicrous speed. While skiing, the game even gives you a speedometer so you can shoot for MPH or KPH targets before going for a high-speed flag grab. That aspect of the game alone is fun enough to be its own thing, but the real fun comes when you blend that high speed with projectile-based combat.
The game's weapons tend to lean toward the "slow-moving projectile" type (mortars, grenades, "spinfusor discs"), and these projectiles inherit 50% of your velocity. So as you fly through the air, your projectiles' behavior changes slightly. This is a formula for some extremely satisfying shots. When first starting to play Tribes, you will miss roughly 95% of your shots, and your weapons have a slow reload time. But when you are traveling at 180 kph and your target is moving 200 kph perpendicular to you, and you shoot a spinfusor disc perfectly into his trajectory to blow him up right as he touches the ground, it is the most satisfying feeling in the world, and it's a great incentive to keep practicing and improving.
There are very few negatives to speak of. In fact, only one glaring one comes to mind, and that is the matchmaking system. As a player, you "level up" as you earn experience. Your level has a lot to do with how fast you win matches and how long you have been playing, so it is used as a stand-in for your "skill" when matchmaking. This would be all well and good, except for one big problem: there are only two brackets of players. The brackets are: Levels 1-6, and everyone else.
A decent player can get to level 7 within probably five to ten hours of gameplay. And When they go into that first match at level 7, they are in for a shock as they are suddenly up against level 20 players who have all the unlocks/upgrades and have dozens, hundreds, or (soon) even thousands of hours more of gameplay under their belts. Many players have a great time with the game as they are learning, but as soon as they graduate out of the 1-6 bracket, they become a high-speed target dummy.
Don't be mistaken; this game is very skill-oriented. You have to be willing to get stomped on a bit as you learn the ropes, and the 1-6 bracket is great for that. But you have to develop a certain kind of patience to persevere when you first start playing in the next bracket.
Having said that, it's well worth the time and effort of grinding through those first few hours in the high-end bracket to practice, because frankly, this game is too damn fun to just give up on when the going gets tough. And if you really want to practice your flight manoeuvres or your shooting, Hi-Rez has given you the option to play around in empty maps or maps filled with dumb target dummy bots that run around for you to shoot.