I am finding the Apollo chassis as probably the least survivable in the game. It gets mobility killed VERY frequently. Paladins may have front mounted engines, but at least then there's some armor on it. Not so for the Apollo - any artillery that lands near the thing (hurricanes!@%) has a high chance of damaging or knocking out the engine. 20mm goes through the front of it at even moderate ranges(often, of course, killing the driver), and a player with an ion cannon can burn through the front armor of the Apollo before you can fire the 120mm cannon three times.
The 120mm is the only real reason I use the thing. And what a reason! That cannon is perfect right now. It's not stupidly deadly, but in the right hands you can put out some serious pain with it. HEAT rounds can utterly destroy light vehicles and dropships, and the AP is just enough to take out specific subsystems if you know what you're doing.
Speaking of which, can we get a schematic of the cutter? Right now they seem tougher than the Apollo, and I suspect that's because there is a bunch of empty space we're hitting.
Although, as far as subsystems go, I have extreme difficulty killing gunners. Killing the driver is easy, almost trivial on opposing vehicles like the apollo, but I don't think I've ever intentionally managed to kill the gunner. It seems easier to destroy the whole turret, which doesn't make much sense as the gunner should be the squishier target.
I do think this penetration angle limit that other forumers are talking about, should be relaxed or removed. I'm making some (AP) shots at angles that really look like they should be deflecting off the armor, which is kinda a shame as the gunnery is one of the things that makes this game unique.
I also think you should be allowed to fire even if the turret hasn't met up with the crosshair yet. The turret has the wierd need to 'focus' on targets, and this causes bizzare lengths of time when you can't fire at very close enemies (or while moving), especially if you are lagging. I had someone completely shut down my ability to fire at him simply by parking his (empty)hurricane over my tank. The turret goes crazy, and while still mostly 'pointing' at him, I don't have the ability to fire.