Under The Oak
Ens Causa Sui
Yeah, I'll second that, their older stuff is better. Songs like "White Hot Fire", "Endless Slut", "Lord in Chains", and "Take You to Hell", are outstanding.
The first six are all pretty great IMO. The band's first two albums are oldschool quasi blackened death metal, Opus is more traditional black metal and then from Heaven Shall Burn onto Panzer Division Marduk is the band's sound they're kind of known for I guess. I wouldn't call it blackened death metal necessarily but that's probably the best way to describe it. So if you think you like Opus go for it and maybe give it another listen or two before you decide. I seem to be enjoying PDM quite a bit recently myself.
Finally checked out Jungle Rot. Really enjoying the single-minded chuggitude. Could probably use a few leads to break up the constant low-end, but overall I'm really digging this.
I'm listening to Amon Amarth for the first time right now. I've known of them forever now but never actually bothered to listen to them or read anything on them. They seem popular from what I can tell and get a fair amount of media attention (for a death metal band). I'm listening to Surtur Rising right now and it isn't all that bad, they seem pretty cool.