MT, a bane and a blessing.
MT is all about map control. It lets you decide where the fight takes place. Granted much favor to your victory of battle to battle. It also allows awareness. Quite frankly it allows marines to kill aliens more effectivly. Something i've been wanting to do quite frankly.
Pros:
Anti-ambush
Pro sneak phase
increases marine defences
Cons:
Anti-tech
Individual Marine dependent
Makes aliens more defensive

Quite frankly, MT makes aliens not attack marines, but attack things marines can't get to in time. This prevents inflow of res from kills. only thing you'll be fighting is packs of aliens with a fade in the center. not only that, you won't have level 2 weapons, if level 1 huge downer. but, it does provide much map control.

Something i wanted to expierment with, but never felt i had a good enough control with doing.
1 arms lab, 1 ip, 1 armory, 2 obs, PG, MT, Armor 1,3 phase gates.
particularly this is location (PGs) defensive, and outer, (outside PG block points) offensive.

For example, get the basic setup, base PG, and others near/at choke points.
example: NS_NOTHING (i think), cargo hold and mother interface/subspace hall, allows 3 marines to control 5 nodes, while the rest of your marines push on the rest of the map...
those nodes being, no name, mother interface, subspace, mess hall, and shipping refueling, while the rest of your marines push aux gen/mother/port.
Pros: Marines can get to no name/mess/mother all from cargo quickly.
Marines got the advantage of terran, and a huge one at that. + MT so the aliens can't ambush/suprise marines.
Cons: 45+20+35+ + + + res
lots of res wasted where it could of been used much more effectivly, perhaps.
(level 3 weapons level 2 armor, verses, level 1 armor, MT)
(45 for the PG's, 20 for the extra obs, 35 for the MT, but now its 15, so it changes things, a lot)