Um, interesting and professional question.
Mr. Sun Yat-Sen was a Nationalist indeed. As for love or hate? I dont want to get in emotion.
There are a subtle meaning - in Chinese, the Nationalism and the State-ism is different words today. No problem, when a Nation-State accepts the concept Nationalism, because in this case, the Nationalism and the State-ism is same; But when China accepts the concept Nationalism instead of the concept State-ism, we would have big inner problem.
The Nationalism Movement was just the things Mr. Sun Yat-Sen did, then his inheritor Chiang Kai-Shek was also did that.
What was the outcome? Various inner-country Nationalism Movement; The country have been divided; The country's interest had been threw into mud. The extensively inner babelism occured at that time. The Nationalists might do few things. The people became divided.
IMO, the State-ist's victory and the Nationalist's lost is more exact to describe Mao's victory and Chiang Kai-Shek's lost. The Nationalist's lost due to the intelligentsia omitted the different notions.
Does the China of today still love him or consider him a rebel?
IMHO, Too many babels we already have. Too many identities were introduced, such as class, nation, religion, etc. It causes divided-people state. We ought to get back the traditional United-people-country thinking.
Maybe it is harsh to other forum members. If so, sorry I don't want to offend anybody.