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I was doing some testing in multiplay practice and found how out how long it takes for each vehicle to takwe out a structure single-handedly, no repair, and on continuous fire.
NOD------------------TIME-------SHOTS
light tank:--------65 secs------44
mobile artillery:--37 secs------25
flame tank:--------35 secs------N/A
stealth tank:------35 secs------24

GDI
medium tank:-------55 secs------37
mrls:--------------42 secs------36 (6 salvos)
mammoth shells:----39 secs------39
mammoth rockets:---26 secs------28

Forgot to count the number of shots for each, so i might go back and do that later.
Anyway, here are some interesting points:

1.mammoths are the best at taking out buildings with their rockets, which have a short range, so use the shells until u get up close enough. Unfortunately most people are too afraid to get their shiny new mamoth scratched, so u cant really mammoth rush on public server. Shame
2.Stealth tanks do just as must damage to buildings as flamers, but get killed twice as fast. Though with a squad of 4 stealths, it might be possible to sneak into their base (base defences must be down) undetected and suddenly fire on a building near the back.
3.for all intensive purposes it appears mobile artillery is better than mrls. The ma has a fully rotatable turret, deals damage faster, easier to aim (at least in my opinion) an i believe the shell is faster too. Though i guess the multiple rockets could be useful at certain times, instead of just one shot.
4.Some people have posted ideas about light tank rushes on agt and med tank rushes on onlisk, but apparently they wouldn't be as effective as a flame rush. Even though the light tanks get to fire before the flamers do, i think the flamers would still kill faster in the end. Medium tanks might work ok, but obviously not as good as a flame rush. You might also want to try a mammoth rush if u can afford it and have some teammates with actual cajones.

and i KNEW that rockets would kill buildings faster than the shell. i had tested that myself, but even devinoch said the shells would kill it faster. thanks for varifying that!

Anyway, here's a good tatic for Mesa. At around 400 credits try and organize a group of 4-5 gunners. Have your group take the path down the barricaded side of the base until you reach Nod's barricaded side overlooking their refinery. Once all your gunners are in position, start pounding away on the refinery. I beleive that 5 gunners took about 2 reloads to bring down the building.

gunner/rocket soldier.....6.5/min
grenadier.................5.4375/min
PIC/Ravenshaw.............4.0/min
mobius/mendoza............5/min
patch.....................3.9/min
chem warrier..............4.25/min
BH heavy assault..........3.9/min
BH stealth................3.0/min
flamerthrower.............2.5/min
engineer..................-6.0/min
tech/hotwire..............-12.0/min

vehicles(extrapolated from earlier data)
medium tank........10.9090/min
mrls...............14.2857/min
mamoth shells......15.3846/min
rockets.....23.0769/min
light tank.........9.2308/min
flame tank.........17.1429/min
stealth tank.......17.1429/min
mobile artillery...16.2162/min

Also most weapons seem to do double damage when shot at the mct.

I hope this infomatoin helps u form new strategies and make intelligent decisions about how to take out buildings. As for me, im off to put some of my own strategies into action on the battlefield. l8r