Honestly, there is no cheap kill unless you spam an unblockable that makes you unable to move. For warden it would be shoulder bash + double side light attack. What i find the most annoying and absolutely broken are the conquerer shield bash combo and the lawbringers throw combos. Everything else I think is fine such as ledge kills and wall spikes. These are aspects of the game meant to be used and people just need to be aware of their surroundings when fighting.
As far as "powerful" go, I'd say Raider's got Warden beat. Yes, the shoulder-mixup is scary, but Raider's can pressure you no matter what.
If you're exhausted, he can spam Unblockables and feints to destroy you, and there's literally nothing you can do but guess for your life and hope you get it right.