The Experimentals in SC2 are hit and miss. They have the Cybran dragon which is a kill em all beast, but they also have the drop cannon, which is just a really convenient transport and factory. So I think it's more a matter of controlling yourself. Having played the scenarios, I've learned to do without experimentals, but defend against tehm quite successfully. Like all games, you have to limit yourself to increase the challenge.
But yes, TA set teh bar for real physics RTS. SC wouldn't be the same if it didn't have teh creator. Starcraft and all are fun, but too small and arcade-like to really compete with TA and SC. Btw, my best move in TA was when the enemy Commander was walking towards my defense line. If I popped him, he would eat a giant hole in my line and I would be screwed, so I told my weapons to hold fire and I got a transport to pick him up and flew it as fast as possible to his own base. It got well in before the AAs took it out, and him, causing the heart of their base to go POP! If you're ever in one of those suicidal jams, try it.