He has been the player he was expected to be when healthy. The problem is no one expected that would only amount to 60 games in 6 years after his rookie season.
Year 1:
81 GP 56 points
Healthy, but he was a rookie and it was a lower scoring era.
Year 2:
61 GP 57 Points
missed 20 games to a high ankle sprain and was never 100%
Year 3:
67 GP 64 points
missed 15 games to a high ankle sprain in the other leg, still not 100% from the previous high ankle sprain. Never was 100%
Year 4:
77 GP 82 points
still not 100% from the previous seasons high ankle sprain, missed 5 games, can't remember what the injury was
Year 5:
68GP 78points (final 13 games canceled to covid)
healthy for the first 60ish games, still manages to miss a game in the middle of that stretch to injury. Production falls off a cliff due to injury the final 8 games of the season but he was still playing
Year 6:
21gp 18 points
Still nursing the same injuries from the end of year 5, and a broken rib from training camp. Aggravates his neck to point of needing surgery and misses the rest of the season
Year 7:
31 gp 21 points
fresh off surgery