Parallels with Hitler.
Dictatorship.
Fascination with military advancement, way beyond most places. That supergun was something else.
And the biggest reason for me.
Invades his neighbours on a regular basis.
Most dictators are cowards, and dont become involved in high risk invasions of other countries.
Saddam is very unusual in this respect.
You get border skirmishes all over the world, the ya boo incidents, but this guy does the full scale invasion of another country stuff, and hes done it twice.
Even Stalin kept his excesses within the USSR, and took advantage of circumstances in WW2 to land grab half of europe in the aftermath.