NHL Ranks
Last 4 seasons - 10th in Even strength points (5th among Centers) -- McDavid, Drai, Matthews, Mack top 4 -- 36 more points than Mika
Last 3 seasons - 10th in Even strength points (5th among Centers) -- McDavid, Drai, Matthews, Mack top 4 -- 27 more points than Mika
Last 2 seasons - 13th in Even srength points (5th among Center) -- McDavid, Drai, Matthews, Mack top 4 -- 17 more points than Mika
So yes, he scores at even strength.
He's a good 5v5 scorer, but the answer to whether he's a good 5v5 player is murkier. I won't dispute the talent, but Schiefle cheats a lot to get his points. Moreover, he gets a boatload of ice time to boot. He's a net negative at even strength.
Plenty of elite scorers are also porous defensively, but they're mostly wingers and they tend to get more than they give up.
Last 4 seasons - 2nd in 5v5 goals against (2nd among Centers) -- McDavid is #1 (With a +34 differential to Schiefle's -4)
Last 3 seasons - 1st in 5v5 goals against (1st among Centers) -- (-6)
Last 2 seasons - 2nd in 5v5 goals against (1st among Centers) -- (-8)