"I'm very disappointed in myself; it was pretty pathetic," the Blues captain said. "I didn't really do much this series. If I'm not doing my job, I can't expect anyone else to do theirs, so it's tough. I have to obviously improve and especially in the crucial times, it's very disappointing."
The Blues, eliminated in six games by the Vancouver Canucks last season after winning the Stanley Cup in 2019, were outscored 20-7 by the Avalanche. Colorado's power play was 6-for-12 (50.0 percent), and its penalty kill was 7-for-9 (77.8 percent).
O'Reilly chalked it up to the Avalanche being the better team.
"Oh, clearly," he said. "We didn't even give ourselves a chance. I thought we would have been able to kind of tilt the ice a bit more. With the way they play, they're going to have momentum at times, but we sure didn't grab it back like we needed to and sustain pressure. We were sporadic, it wasn't consistent, and clearly you see what happens. They dominated us."
RELATED: [Complete Blues vs. Avalanche series coverage]
O'Reilly predicted a Blues upset prior to the start of the series. This, despite the fact the Avalanche won their last five regular-season games and the Presidents' Trophy, awarded to the NHL team with the best record in the regular season.
Said O'Reilly before the series opener six days ago, "We're going to have some fun and we're going to beat them."
Avalanche captain Gabriel Landeskog was asked if he felt the proclamation motivated his team.
"Uh ... yeah, it did," he said.
The Blues failed to contain an Avalanche team that had 11 players with at least one goal. Goalie Philipp Grubauer even earned a secondary assist in the win on Sunday.
Colorado's top line of forwards Landeskog (two goals, six assists), Nathan MacKinnon (six goals, three assists) and Mikko Rantanen (one goal, six assists) did most of the damage.
"They're a very good line, they're going to get chances and going to make plays," O'Reilly said. "But still, I had the opportunity early to kind of see a lot of that line and play them harder and I'll just say I didn't do my job."