Reaves was never brought in to play like James Neal or David Perron - that's obviously not the way he plays. Since the game where he was given 2 bogus penalties in the 7 minutes he really hasn't been bad. He hasn't helped too much, but hasn't hurt the team either. Tatar has shown good signs, but has so far been unable to really connect with a steady line - so far. I expect that to change.
The team has not been the same since Neal went out and as talented as Tuch, Hyka and Tatar are, they simply haven't found the right chemistry with Perron and Haula. Losing Smith is obviously having the same effect on the Karlsson/ Marchessault line.