I do agree though, the Goliath in UT2k4 seemed much more powerful/stronger than the one in UT3.
The main gun is quite powerful, but the tank is very slow and has poor maneuverability. The turret rotation is also very slow and cannot keep up with a fast maneuvering manta. It's an easy target for scorpion explosion and viper self destruct. And yes, you can jump down on top of it from a building in Downtown and kill it rapidly with your link. You can also sneak up to it and point blank with flak will kill it pretty quickly. It's definitely not the tank from UT2K4 at all.
Tactics, timing, skill, and teamwork are very important to make good use of the tank before it is destroyed.
All UT3 vehicles can be and are coffins at times. They all require a great deal of experience and skill to master. They also all usually have very short lives during the game. An experienced player can pretty much take down any vehicle under the correct circumstances. Weapons are very powerful in UT3, and even with reduced damage to vehicles can usually make quick work of any of them.
UT2k4's vehicles were badly balanced. UT3's are even worse.
They all still feel very weak...except the Manta which is overpowered.
That was a very early argument that died off once players discovered how well the Avril worked and took the time to grab one. Now the latest argument is that the scorpion is too powerful, the self destruct has too large a splash radius. Which it does of course. You do not even have to hit anything, just be sorta close to take 400-600 damage on a tank, paladin, or groups of vehicles. You can take out 2-3 scorpions and benders in a single move. The UT2K4 vehicles were much easier to use, much easier to get kills with, and had much longer lives.