Fiala's mediocre production relative to his talent level is because of;
- Terrible linemates. Confirmed 4th liners like Rask, Gaudreau, etc.
- Bad luck. He really has been hittng a lot of iron.
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He tends to overhandle the puck, and try and do it all himself, i.e., will get past two players, then will lose the puck while trying to get past the 3rd. Some might argue that if it's a choice between passing to Victor Rask or trying to stickhandle past an opponent then you do the latter, even if it's against someone like Slavin.
The jury is still out on how good of a player Fiala is. He is fast, as well as quick, with excellent hands and shot. Surprisingly strong for a guy that 5'10"- size is not an issue.
If anything, he needs to calm down, as he tends to take penalties. The only thing that might limit him is his hockey IQ. His creativity is really good, but has trouble id'ing when to, and not to, make a risky pass or play. A lot of Wild fans are hoping that he gets to play with a talented linemate(Boldy? Rossi?) if/before we decide to trade him. He definitely has the talent to be a 60-75 pt player, IMO.
It could also be that he is a talented player that simply underproduces in the NHL for his entire career.