1. Win/Loss record and winning percentage:
As already mentioned, the Sens are 2nd in the Division with a 10-5-5 record, good for a 62.5 winning percentage, which is 8th best in the league.
2. Conference standing:
2nd in the Division places them 4th in the Conference, so a home ice advantage in the first round if the playoffs started today. Which they won't, of course.
2.9 goals for per game, puts them 7th in the league. Shots per game is 28.7, which is 22nd in the league.
2.7 goals against per game, puts them 19th in the league. Shots against are a league-worst 34.3.
If you have other parameters to assess the team on, throw them on the pile (individual performances from Karlsson, Stone, Hoffman, for example). What I'd like to see is whether they are at, below, or above where you expected them to be this season.