Turrets are ineffective. Shurikens and explosion potions decimate them in short order.
Using multiple factions traps is pretty dishonorable. I can understand, maybe, TB using up an inactive faction's gas traps, since that base is the size of a small city with very few choke areas. Any half-assed thief can make a mockery of that base, no matter the defense. It takes a constant 10-hours of straight work to keep that base locked down against stealthers logged in the base, and then actually killing said stealther in said ginormous base is a whole 'nother game.
Still, 30-45 explosions on the bridge is just sick, wrong, and cheap.
Unfortuantely, the fact is, without traps/guards CoM and TB bases are the hardest to defend. Minax and SL are both small, compact, and very very fieldable. They are also set up prime for ambushes and trapping entire groups in a small killing field.
SL's layering also allows for ridiculous thief detection...detect, especially passive, shouldn't go through 2 floors like that. A single person with detect hidden put in the corner of the sig room can keep all thieves from getting in hidden.