Alright let me clear a few things up first,
1 This thread is design to help you, to help players to use the Spartan Laser the way it was meant to be used, not only that but to help you be a better team player, i cant even count how many times someone on my team or the enemy team get the laser and waste it, they don’t miss, but they still waste it,
which i will explain more of later on.
2 I know that this wont help out much, but i did this same thing for reach on the bungie.net forums before it came out.
3 As i said, this is designed to help, designed to help you and possibly your future teammates to better use the laser and use it correctly, to be able to help your team in ways that could turn the tide of a match.
either way i hope this helps, and if you want you can contribute as well, i would definitely appreciate it.
Now lets begin.
The Basics
first things first, you need to know what to use it on,
Vehicles:
the Spartan Laser is designed to be an Anti Vehicle/Air Weapon, and that’s what it should be used for, majority of times people will ignore this fact and use the laser for easy infantry kills, waste every valuable shot,
how are they wasting it? picture this,
you have an invitation, its separated into 4 pieces, every time you shoot a vehicle with the laser, you get to keep a piece, every time you use it on infantry, you give them a piece.
Now ask yourself, what exactly is this invitation? that invitation you just gave them (assuming you used every shot on infantry) is free reign to decimate you with vehicles and now you cant do anything about it, yet if you use those shots on vehicles, you are not letting have that invite, helping your team,
That is what i see people do every time they get it, they waste it on infantry, when they should be waiting to use it on vehicles.
Its clear why most people do this, the laser can give you very easy kills, but this is a big mistake, especially when things like banshees and tanks come into play.
here is my point, the laser is designed to take out vehicles, choosing to take out infantry instead is a huge mistake, one that could cost you the victory, the laser fires instantly, it may give you easy infantry kills, but this is a fatal mistake, you have DMRs, BRs, ARs, Shotguns, Snipers, and much more, you already have what you need to take down infantry, use that instead,
there are several other reasons to do this, you will find a lot more success if you control the map, and that also means having complete control over the enemy’s vehicles, this is Halo, and vehicles are not to be underestimated, never assume they have no vehicles, chances are your wrong,
that’s basically it, i did this same thing on the halo reach forum on bnet before reach launch, and while i know this will be about as successful as that was which was not successful i still felt the need,
the Spartan Laser is still the Spartan Laser, i think its safe to assume that it works the same way as it did in Halo 3 or Reach in Halo 4,
Secondly, as a quick note in regards to using it, you must make every shot count, just as i said before, use it on vehicles, not infantry, take your time, take note of where the vehicle is going, its surroundings, your surroundings, cover, and where it will be, take note of all of these things before firing to insure a direct hit, ive messed up quite a few times by not taking note of where it was going, i was about to shoot it and it went behind a structure, it was to late and i fired and waisted a shot, so do take not of that, that applies to air and ground vehicles.
Feel free to contribute if you have any other useful advice in regards to using the spartan laser, i may edit this and add more later on.

but you HAVE to admit op, using splaser on infantry is just fun! i have built non vehicle maps with the splaser on them just for the fun of having it.