No.
Winrate alone is a crap factor for analysis. Look at Heimerdinger's pickrate too, he had his 2 days of bing FotM, but after that only his mains pick him.
Also, Heimerdinger is a counterpick for Melee Midlaners like Zed and Talon and Assasins in general. So when he is picked he is expected to do well, an most likely win.
Contrast that to Zed, Lee Sin or Riven that are ''popular'' champions, and thus end up with lots of people, most likely bad that good, playing them.
He is possible one of the most aggravating non assassin midlaners to play against while using a melee midlaner being a huge lane bully
Fixed. And that is completly OK, despite Riot's efforts. Mages with decent range simply spam /l while instakilling his turrets and poking him to dead. Syndra completly invalidates his Upgrade! Big Turret with her W. Lux, Xerath and Velkoz destroy him with poke. Malzahar simply thanks him for the free mana recovery and pushes equally hard.