There's no question we need more from Vinnie Desharnais, especially at evens. He hasn't been swiss cheese, but he also hasn't really been all that noticeable.
We know Desharnais is capable of more, because he was a lot more noticeable in the regular season. He showed he was capable of complementary offence, putting up 1-10-11 and a +3 in 78 games.
However, so far in the playoffs he has produced 0-0-0 in the eight games with a -2. The only silver lining is even despite this drop-off his coach trusts him more, as his TOI has gone up from the regular season, from 15:43 to 16:34.
One of his positives is Desharnais's PK abilities - and along with his total TOI that's also seen a slight uptick in the playoffs as well. During the regular season he was third on the team in PK TOI with 2:02, while in the playoffs he actually leads the team in PK TOI with 2:28. Although that might have something more to do with the occasional defensive hiccups that Cody Ceci and Darnell Nurse have been putting up rather than simply his own merit.
It's not inconceivable that a player with a mere 134 NHL games to his name might have some flaws to work on, since when someone is not yet at the 200 games played we don't know completely what you have in him. (114 in the regular season, 20 in the playoffs over the last two seasons.)