Ok I didn't realize the Battle of Florida wasn't gonna start until today so I'll give intial thoughts:
East:
Capitals vs. Canadiens - Apparently teams forgot the #1 rule when playing the Caps this year: you don't leave Ovi open. It extended into the playoffs as well (I didn't realize Ovi never had an OT winner in the playoffs until this past game). Caps faultered a bit in the third though. The Canadiens have nothing to lose making the playoffs this season, so the Caps are really going to have to clean it up to finish this series off early. I think their lack of team playoff experience might hurt them if they make a deeper run.
Hurricanes vs. Devils - I have Carolina sweeping this series. No Jack Hughes is too much for the Devils to cope without. They are playing well but Carolina's tendency to shut teams down has started to take effect. The Canes are going to need to get that PP going though at some point if they want to last in the playoffs this year. I think Dallas might regret trading Stankoven he's going to be really good in the future, even if they got Rantanen out of it.
Leafs vs. Senators - Even though the Sens lost game 1, I thought they played fairly well 5 on 5. Too many penalties sunk them. They played better in game 2, almost had a chance to win at the end, but poor defense on the OT goal. Very curious to see how they play at home, no playoff hockey for a while has got to get the fans going. Toronto looks much better defensively than they have in recent years. Matthews is going to have to do more than collect assists though if they want to thoroughly start breaking their curse.
Lightning vs. Panthers - Missed most of this game. I saw the score and was like uhhhhh what happened. Tkachuk is back and makes an immediate impact, Marchand looks like he's settled into the roster, PP is chugging. Tampa looked disoriented from general highlights. They had some great plays but too much of the Panthers caught them earlier in the game. Florida looks ready to continue where they left off after winning the cup. I still think this series has potential so let's see how game 2 is.
West:
Jets vs. Blues - Very close games, the Jets just find a way to win but the Blues are hanging right with them. Both teams settled into game 2 after the goal fury in the first period of the first game. Really think it's gonna come down to the goalies, can Hellebuyck make up for last year's debacle and settle in?
Stars vs. Avalanche - The pace in this series is unreal, both teams want to play up-tempo. If the Stars had Heiskanen and Robertson healthy, I think this series tilts more towards Dallas. Seguin makes an immediate impact back in the lineup. Wedgewood getting some playoff game experience with the Avs but not sure if he can handle the load in net. Landeskog would be a big boost for Colorado if he can go. I'd say this is the series to watch if you're going to pick one to follow (if the Lightning don't wake up in their series).
Golden Knights vs. Wild - Bit of an odd series, wasn't sure what to expect going in. Vegas ended up taking their division but Minnesota held out for a wild card spot. Vegas has a scary roster but not as much playoff experience as when they won their cup. Minnesota getting Kaprizov back is huge for them, he made his mark in game one. Game 2 is heading into the third as I type this, missed most of this game but wasn't expecting so many goals for the Wild. Haven't had much time to watch either of these teams this year, but if Minnesota can regain the form they had before Kaprizov was injured, they could cause some issues for the Golden Knights.
Kings vs. Oilers - What a game. LA in full control, then proceed to let McDavid do his thing, and we almost have a hell of a story until a janky goal goes in with not much time left in the third to lift the Kings. I have them winning this series as I think they can finally get over the hump, but they can't let Edmonton's big guys contribute as much as they do. (Jeff) Skinner finally gets to play in a playoff game, but (Stuart) Skinner didn't look all that great. If Edmonton can shut down LA's speed they might be able to be carried like they have in previous years by the star players, they got really close last year, but at some point they're going to need more contribution from their depth guys.