If both tanks know what they doing, and healers keep up heals than odds are u will win. (Garuda ex)
I did Titan EX last night as part of a PF title "Primal Focus" ofc I knew that was complete BS after checking gear ect. but none the less I still join as tank. first attempt got as far as Superbombs but 1 hear die and 1 dps, wipe.
2nd attempt made it to superbombs and die again. Normally I will dish any pt with misleading titles, as I'm sure this guys were not primal focus ready BUT they could dodge plums/LS so I knew they had clear potential, just needed bomb patterns. (1 healer die after GC from superbombs another wipe).

Anyways, I ended up staying till the 25% buff and clear it. the pt chat was spam with "OMG", "Finally" "YES" right after clear. with 4 people saying they will go practice Ifrit. in DF.
The moral of the story is that if you find a lucky group that makes it past Heart, dodging everything perfectly, with troubles in superbombs, odds are they have clear potential and is best to stick till the end. Normally I don't do this as I want an easy clear not waste my time but it does feel great when u see people celebrating with joy after finally clearing titan ex.