If Hitler didn't do the Holocaust, would he be considered like a modern-day Napoleon?

He made a lot of tactical errors out of arrogance that could have been easily avoided, so maybe in that aspect.

Maybe.   But be fore Hitler, Napoleon was used as an avatar of evil by many people in the Western world.  Nowadays we say stuff like "this guys a Nazi" as shorthand for them being evil.  But in the late 19th and early 20th centuries they obviously didn't have that.  So if you're sitting around in, say 1910 and you wanted to compare someone to a uniquely evil figure in world history one of the options for you would be Napoleon. 

Also keep in mind that Hitler was regarded as incredibly evil by much of the world well before the Holocaust was publicly known.  Allied leaders knew about the Holocaust to some extent through the reports of resistance members on the continent (including a Polish fighter Witold Pilecki who voluntarily allowed himself to be sent to Auschwitz to gather intelligence).  But the general public didn't really know about the Holocaust until the Allied forces began liberating death camps. Hitler was still regarded as incredibly evil even before that.  His non exterminatory persecution  of the Jews was enough to taint him as a monster in the eyes of many people in the West (casual anti semitism was rampant in many of these countries but the people were horrified by the extremes to which Hitler took it, even before they knew about the systematic extermination of Jews).  His dismantling of German democracy and his unprovoked aggression towards his neighbors also marked him as a monster to most people outside of Germany. 

Both men invaded and conquered their nations' neighbors and then the neighbors' neighbors.  

Both men said they were spreading their ideology by conquering their neighbors, and that they were keeping their nations safe from the neighbors' evil design to conquer them.

Both men ruled their nations through personality cults and military might.  It was General Bonaparte (later The Emperor) / Herr Hitler (der Fuhrer) speaks. We listen.  He commands. We obey.  He leads.  We follow. Why?  Because he has saved us from our despair and apathy and made our nation great again.  The people let their leaders think for them, and woe betide those who thought and acted otherwise.

Like Napoleon, he over extended and suffered the Russian winter.

Consider this .  Hitler was on 90 drugs .  Would you want a national leader on 90 drugs >  Bad stuff, meth, opiates etc.  Here is a statement from an author ... Norman Ohler, writes that “Doctors and drugs account for much of the internal structure of Nazism.”

No because Hitler wasnt a tactical genius, there are probably others like Rommel that could have been looked at more favorably though

Napoleon did not have a good reputation for years after his death either.