Putting APM mines/RDX packs at spwn points. Okay if it is a spawn beacon; I mean, you lay it out and you take your chances. Not okay for fixed spawn points.
Chucking RDX demo pack to kill infantry. In FF off servers, I am guessing. This is not like chucking grenades or shooting. If it was a FF on server, you would be blown sky high committing suicide. This is chuck chuck BOOM. Even worse than noob tubing.
Use the assault pod to destroy vehicles. Fun, and part of the game.
Use the air transport to take out walkers/armor. Ramming. Ramming sucks, but desperate people do desperate things. Once in a while it is okay. As a primary form of attack it is stupid, wasteful, dishonorable, and cheesy.
Using the gunship as a form of transport to board titan. Against. It is just a terrible use of one of the most effective vehicles in the game.
Putting down dones near the enemy and go hide. Smart. This is called TACTICS. That is what drones are for; use them and save your own skin. However, same use on spawn points as APMs and RDX. Spawn beacons okay, fixed spawn points not okay.
Putting down motion mines on front of the enemy titan. I personally dislike this, along with putting them on the shield, but as long as it is allowed, it is part of the game. Again, TACTICS.
Sitting on the titan guns all day as an engneer. Smart, and effective. Keeps the guns in action, and helps fire support for your team. I am sure it makes your day difficult if you are the Engineer running around under the titan trying to blow the turrets up when the guy keeps killing you, but it is STRATEGY.
Forgot Jihad jeeping. Sucks. Wimps and cowards.