Massed grav? Or just chuck bodies at it and keep it tied up. On the other hand it has some kind of souped up overwatch which could make that tricky, but I can't remember what those overwatch guns do
You're thinking of the KX139, the new FW titan. This is GW's new suit, and as a GC, it has no overwatch available.
I think the biggest problem with LoW/GMC -though this discussion could most likely be its own thread - is that its like flyiers when they first came out and the Helldrake and 'Cron Air was king. Not everyone has them. I play Sisters, Dark Eldar, and Mechanicum in 40k. Sisters ill remove from the discussion because, well you know. Dark Eldar don't have a LoW, the 1 character that could have been a candidate to be a LoW, instead of giving Vect a brand new model like Santa Claus had for SW, he was just flat out removed. My Ad Mech don't have one short of the War Convication. 'Nids dont have one, while the Marines have LoW are they comparable in what they offer an army/list to these GMC LoW? Yeeah the Imperium have Knights but still, built into their own books they are lacking.
This is why I think 30k is insanely rather balanced, everyone has options to pretty much access to a huge array of LoW, which even then they all have access to the same ones, so it some what balances itself. Yes other choices are better than others, but since everyone has access, good or bad, it balances itself. Yes there are more diferences between 30k and 40k that affect this so its not as simple as just giving everyone access. But it does address the issue of everyone having LoW/Super Heavy/GMC which I think is a really big problem for 40k right now.
I have to disagree, not on the fact that there's too much power creep, but on the fact that LoWs are readily available a lot now. Because the Imperium are all Battle Brothers with each other, the Imperial Knights were probably the absolute smartest thing that GW could have done, because ANY army is allowed to take them. You're just limited by what your gaming scene allows for allies. The War Convocation is actually BETTER than most other armies because in allowing the Knight to appear, it also gives him additional bonuses. No other army gets to do that.
You are correct that Dark Eldar don't have a LoW, though does it fit their style to have something that massive? Honestly, I'd have said the same for Tau before these new suits dropped. The only reason Chaos got one was FW (unless you're playing Khorne, then you get the Lawn Mower). is FW also.
As for 30k... of course it's balanced. if you're not Mechanicum or SolarGuard you're playing the same army with different paint jobs.