I reckon they are much more better than the Nod's mobile artillery, like when i was the GDI, the Nod was coming at us with 3 mobile attillery, i hadnt enough money for anythin special, so i got the MRLS, during this the rest of my teamates were just attacking, without great success, so i was left alone to take them all on. They spooted me and treid to destroy me, but i fought back (duh, iwasnt just going to let them attack me ) and i managed to destroy them with more than half my health intact.

So the conclusion is, that am either a very good driver
or
they were all crap