It was. Carlson -4 and Fehervary -3.
It's not like they were the only ones though. Jensen finished the series -5 and Orlov -4. TvR with the team-best +3 and Schultz +2.
Orlov/Jensen were getting the shutdown duty, we knew that there were going to be some goals against them by the time the series ended. You can't keep the Florida top 6 quiet for an entire series. There were definitely moments where they could have played better (Jensen had a couple uncharacteristic brain farts, for instance), but it wasn't egregious.
The Carlson/Fehervary pairing generally got easier match-ups than Orlov/Jensen. And their mistakes were more glaring. Most of all, it was the timing, as their mistakes seemed to happen in a gigantic avalanche in games 5 and 6. Carlson's utter buffoonery in game 5 replaced Weegar's from earlier in the series as the whipping boy of both D corps. Then the two of them continued it into game 6, where they spent the entire time digging the puck out of their net.
What's most troubling is that this isn't new with Carlson. He's had a bunch of bad playoff performances in a row. He has
one even-strength point in the past four playoff campaigns combined. He was utterly terrible against Boston last year, albeit some fans were willing to excuse it due to injury. Same with the previous year against the Islanders, but once again some fans were willing to overlook it because the entire team looked like they were on vacation in the CoVID bubble. But this season has gone to show that those weren't anomalies. Carlson is one of the Capitals most at fault for their recent streak of first round exits, and it's not acceptable for a player with an $8M contract.
TvR had an great series tho. He should get more accolades for it.