As long as we are healthy on D, we are going to be going deep in any series.
We won a 7 game series with scoring more than 2 goals only TWICE all series against the Islanders. That's very hard to do unless your defense is amazing. Kuzy may have gotten a lot of credit for stepping up - and he deserves it, but he did only score in two games last series in 7 games. The defense showed up basically every game.
Having three lines of great defense in front of a goalie who now a no doubt a franchise goalie makes us a feared team and a team that is going to be tough to play against. We can shut teams down by preventing shots - or if our defense does have a bad game (rarely), we have a goalie that can bail us out/win a game on his own too.
Forward lines are all still struggling offensively big time IMO - which is to be expected with the lack of talent/skill/consistency that is on the forward roster outside of Ovi/Bacstrom. However, at least most of the forwards that are very inconsistent and have been disappointing offensively (Brouwer/Laich/Ward/Chimera/etc) all at least show up and do a decent job in the defensive zone. When Johansson wasn't scoring he was even laying out hits last series. They all seemed to at least be beneficial in some way - which is important when you're a forward and are not scoring.
We are the type of team that will hardly ever win 3 or 4 games in a row (like we saw during the entire regular season), but we're also a team that is in every single game. When we lose we very rarely lose by more than a goal or two. The Caps are in almost every game in the third period.
Since we stink at scoring goals with these current lines - but are amazing at preventing goals with these current lines.... that equals another long series ahead of us. It's going to probably come down to a game 6 or 7 once again.