Gomez and Legwand were atrocious additions by the GM. Yes, Dzingle hopefully will contribute much more than those two.
This qualifier may come from the fact that some people have unrealistic expectations...
Gomez was just a jersey filler on a team decimated by injuries, needed to close out a season where the team was going to miss the playoffs. Like really, who cares? He played 13 games for peanuts lol
Legwand was a cheap veteran center signed as a UFA (didn't cost any asset) to back up 3 very young and not very experimented centers in Turris, Zibanejad and Pageau. Those centers were graduating after the loss of Jason Spezza. And Legwand didn't even had such a bad season. Maybe you disliked him but 27 pts for 2.5 M$ and a veteran presence is nothing "atrocious"