I guess I have to do the annual Stop Caring About Plus-Minus And Especially Stop Caring About Plus-Minus For Offensive Players On Bad Teams post again.
Yes, Nick Suzuki is -16. No, this is not something we should care about at all. One of the biggest problems with plus-minus is that it includes shorthanded goals, and more importantly, that it INCLUDES EMPTY NET GOALS. I'll break down Suzuki's GF/GA numbers by situation as follows:
5v5: 39GF, 43GA (-4)
4v4: 0GF, 1GA (-1)
3v3: 0GF, 3GA (-3)
PP: 17GF, 1GA (counts for a -1)
PK: 1GF, 11GA (+1)
Canadiens' Net Empty: 3GF, 13GA (net -10 but counts as a -8 for plus/minus purposes because two of these GAs have already been counted under the 5v5 stats)
Opponent's Net Empty: 1GF, 1GA (0)
That breakdown makes it obvious why it's silly to use raw +/- in general, and why it's particularly misleading with players in Suzuki's situation as the go-to guy on a bad team which is going to be trailing in a lot of games and frequently have to pull the goalie. There is absolutely no good reason to value empty net goals the same way as even-strength goals when assessing a player's two-way ability, and that is exactly what +/- does.
His overall -16 comes from a -4 at 5v5, -3 in the OT minigame, -1 in 17 minutes of 4v4, and a -8 from being on the ice with the net empty. Suzuki being -4 at 5v5 50 games into the season on this team is not in any way concerning, and over half of the -16 comes from empty net nonsense with another quarter coming from tiny samples of 4v4 and 3v3.