I'll give Dubas a score for every player he acquired on the team considering WAR (or market value) per cap hit, which is probably the most important metric in a cap league. I'm also only considering players that will make the NHL playoff roster.
Players that were not his acquisition as GM: Matthews, Marner, Nylander, Rielly, Engvall, Holl.
Minimal impact players not worth rating: Spezza, Clifford, Simmonds.
Looking at his acquisitions:
note - Market values are totally subjective and this is meant to be an approximate valuation, not takin literally. But I think you will find them all within reason of 1-2 million of their market value. Younger players and older players out of form are the hardest to value and therefore are the most volatile. Lilly and Muzzin were the hardest for me to rank and could easily have their market value swing in either direction just by 4 weeks of good or bad play.
Bunting (+51) Market value = 6 million. Actual salary = 0.9 million. + value of 5.1 million.
Mikheyev (+23.5) Market value = 4.0 million. Actual salary = 1.65 million. + value of 2.35 million.
Liliegren (+31) Market value = 4 million. Actual salary = 0.9 million. + value of 3.1 million.
Brodie (+15) Market value = 6.5 million. Actual salary = 5 million. + value of 1.5 million.
Blackwell (+13) Market value = 2.0 million. Actual salary = 0.725 million. + value of 1.275 million.
Kase (+7.5) Market value = 2.00 million. Actual salary = 1.25 million. + value of 0.75 million.
Giordano (+6) Market value = 4.0 million. Actual salary = 3.375 + value of 0.625 million.
Kerfoot (+5) Market value = 4.0 million. Actual salary = 3.5 million. + value of 0.5 million.
Kampf (+0) Market value = 1.5 million. Actual salary = 1.5 million. + value of 0 million.
Lyubushkin (+0) Market value = 1.35 million. Actual salary = 1.35 million. + value of 0 million.
Total surplus positive value of 15.2 million over market value.
To volatile to rank: Campbell.
Unsure of playoff status: Sandin.
I'm unsure if Sandin will make it to the playoff roster even if he's healthy over the other 6 d. Campbell is to volatile to rank. He could stand on his head in the playoffs or he could be a complete flop and cost us the whole playoffs.
The negative:
Tavares (-20) Market value = 9 million. Actual salary = 11.0 million. - value of - 2.0 million.
Mrazek (-27) Market value = 0. (not playing) dead cap space. - Value of - -2.675 million if burried.
Muzzin (-45) Market value = 1.0 million. Actual salary = 5.625 million. - value of - -4.5 million if burried.
Total negative value of 9.175 million.
Positive surplus - negative surplus = +6.025 million (or 1 Michael Bunting) lol.
The other 6 he didn't acquire so he can't get credit for them. Plus i'm not overly thrilled about those contracts at the time, even though they have all out played them this year.
Basically he's done a very good job at finding good cheap talent below market value but his 2 or 3 mistakes have really cost him imo.
The volatility factor on Campbell and goaltending in general adds a high level of risk for me which could swing this in either direction during the playoffs.