So much about the playoffs is match-up luck and skill. Last year's Kings run was a combination of both. Vancouver in round 1 missing one Sedin and a headcase of goaltending, Round 2 with a young Blues team minus Halak and Pietrangelo, Coyotes in round 3 which was the first series the Kings were favored to win (and minus Torres), and NJ in the Final with a broken Kovalchuk and a tired team in general that played several more games than the Kings. Crosby-less Penguins were out early as were the Hawks thanks to Mike Smith playing out of his mind. Skill and luck combined.
Blues will have several years to contend with the core they have. We'll see how this current Kings/Blues round 1 match-up works out when the series is done, but I doubt either the Kings or the Blues are wild about going 6-7 games in this series and being tenderized in the process.
This series has the most hits by a country mile vs. other series. It's not even close. Contrast our series with San Jose/Vancouver. SJ lost their last regular season game, got a far more favorable match-up as a result with Vancouver and had a comparative cake walk through round 1. (Their round 2 match-up will be far tougher.)
I would generally recommend to both teams that they avoid each other if possible in match-ups.
The Kings and Blues play so similarly. The Kings are hurting on D but have a healthy front-end and Quick. The Blues have an advantage with their D corps overall save for Elliott but missing a true 1-2 center punch. It balances out. Every game is basically a coin flip, which is why the series isn't over by any means. It takes 4 to win, and the 4th is the toughest.