Harper was a bigot who did his best to weaken the federal government, sow discord with provinces, divide and completely politicize the Senate. He attacked the Supreme Court and mismanaged our finances.

His job creation record post Great Recession is abysmal - amongst the worst in the G7.

He muzzled government scientists so much so that there was actually a protest march by them against Harper.

He cut funding to the CRA, that prevented them from finding wealthy tax cheats and his cuts to the GST meant the loss of billions of tax revenue per year, weakening the governments ability to tackle the debt or create new programs.

The number of arrests and convictions of Harper associates and operatives set a record in recent history showing a level of corruption not seen before.

He tried to severely weaken Elections Canada to make it harder or prevent people from voting.

The list goes on and on.

Harper was one of the the worst PMs in Canadian history, and the evidence is pretty clear.

https://www.theguardian.com/environment/2012/jul/09/canada-stephen-harper-revolt-scientists