Some of the titans weapons seem a lot better than others in the list.
Is the Plasma Destructor really meant to be only MW3+ rather than MW2+ like all other titan plasma weapons? This sounds like a type to me. It seems wrong that the Plasma Cannon kills more than the Plasma Destructor (it previous editions of Epic the Destructor was a fair bit more killy than the Cannon) and I don't see anyone choosing to take the Destructor at the moment.
The Quake Cannon in the Net-EA list is perhaps a bit too good, but the one here seems to have gone too far the other way. 120cm 3BP MW is powerful but not with slow firing. I'd consider taking it at 4BP Slow Firing but never bother at the moment.
The other barrage weapons in the list look great, though the Carapace Landing Pad seems pointless, it doesn't seem worth taking it and missing out on a powerful weapon just to make a single barrage weapon indirect fire
Warhound with twin Plasma Blastgun would make an excellent blitzguard (sit the blitz right in one corner of the table-edge and the titan on top of it angled so that teleporters couldn't appear behind it out of arc). Put it on overwatch first thing and 6 x MW2+ would put off teleporting terminators.
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If you wanted to justify in the fluff for the list mechanic you could say that the weapon is used to it's full potential in ranged attacks but restricted close in due the unfortunate backwash effect on the user.
You could then have a house rule of the Melta Cannon being able to give +2 FF attacks but for each miss/hit (delete as appropriate) the attacker suffers 1 TK hit itself.
This argument isn't really fitting. Melta weapons in 40k are handheld by guardsmen with their bare hands with zero negative effect. Plasma weapons are the unstable ones that can pump out excess heat and kill their user, melta-weapons are safe.
I agree with E&C that the Melta Cannon really should be made more powerful in FF than shooting when you update the list. This is how ALL melta based weapons work in 40k, being uniquely much more powerful at penetrating vehicle armour at up to half range. I'd rather it's bonus FF attack be TK(D3), even if it was felt it needed to reduce the power of it's ranged attack slightly to balance.