The TEC Loyalist titan is somthing of an exception to the rule. Every other titan, (including the Vassari and Advent ones), has some kind of trick for mulching anything lighter than a capital. True, most need at least a couple of levels, and some need more than that. They also certianlly benefit from a supporting fleet and upgrades upto a point.
But give them the appropriatte numbers of levels and that fleet quickly looses relevance against a non-capital spam setup. Because the titans own ability to munch anything less than a capital fleet is so great that anythig less than a capital just becomes XP food for the titan. They're capable of too much AoE for the non-capitals to last a useful amount of time. The Vassari and Advent rebels are particuarlly bad, but the others aren't usless eithier.
In all honesty it's a serious balance concern of mine. Really, really, really, low level titans without too many upgrades or too big a supporting fleet aren't going to be a huge issue to kill with standard tactics. But as the numbers of upgrades and/or the level climbs they become ever more able to brush aside standard fleets through raw AoE capability, to the pont they're going to nueter said normal fleets.