Once you get your head wrapped around that you are listening to a "live amp" but in the "control room" It's fine.
That's the bottom line right there. When you fire up "Back In Black" by AC/DC Angus doesn't suddenly appear in your room wailing away on a JTM 45. What you are listening to is a great amp, well miked, recorded, mixed and mastered. The same concept applies with the Kemper. Once you can wrap your head around that concept the Kemper makes sense. Spinning your wheels trying to completely replicate the device it replaced is pointless and an exercise in futility.