Anti-tanks are still not as good at it and not part of a fast offense. They don't cut it against Modern Armour either, which the Panzer handles just fine. Very useful if you are usually at a tech disadvantage in the endgame. Tanks also come at a reasonable point for cutting off research and attempting world domination with what you have, so depending on level and playstyle this can come up in a good part of your games.
So you're saying that the Panzer is good
if you're at a rather significant tech disadvantage? I'm sorry but, to me, that's not much of a compelling argument as to why they're useful. Outside of deity and
maybe immortal, and even then I'm not so sure, there really aren't that many instances where you're going to be trying to launch a late-game war against the computer when you're lagging in the tech race sans nukes. As I pointed out before, the usefulness of the panzer is directly linked to the number of armored troops the computer builds. I have personally
never seen the computer build a significant number of armored units, and most certainly not enough to justify the panzer. Generally, any late-game stack I see the computer with has a large number of infantry/mech infantry, about fifteen or so siege, maybe ten or so anti-tanks and SAM infantry and a couple of gunships/armored units. Maybe it's different for everyone else, but that's what it is for me.
Anyway, I'll give you the fact that anti-tanks sucks when you're trying to conduct a fast offense. Of course, in those cases, you could just build a gunship which gets +100% against armored units and are cheaper to build (not to mention that, most of the time, you'll be able to build gunships before you can build tanks).
What's wrong with the Navy SEAL? If you're trying to use them for something other than their purpose (amphibious invasions) then, yeah, they'll probably suck, but they absolutely rock for doing what they're supposed to do.