He is a showman for sure but he is not likable and charismatic in the sence of beeing sincere and trustworthy. Analyse his bodylanguage for example and the words and arguments/ phrases he uses. A strong leader can convince the masses without putting the opponent down. Putting others down just lowers the autority of a leader. But maybe this is just eurotrash talking nonsense 
Obama ran on positivity - yes we can, change you can believe in.
Trump runs on negativity - make america great implies she isn't great today.
Nagativity will work on 44% of the people. Positivity can work on 53% of the people.
Trump will get 44% of the popular vote. Johnson will get his 2.7%, Jill will get less than 1%, and Hilary will get around 53%, same as obama.
These things are very predictable. People don't like hilary, they see her as lying and corrupt, but they see her as a continuation of obama, where things aren't going to change all that much. Trump is a wildcard... for every truly awesome thing he says, there's also a "shit, he's just kidding, right?" moment that tags along with it. He can't rule out using nukes in Europe. What? Really? You either don't know the map of europe, or you don't know the effects of nukes. If you knew both of them, you'd scoff at such a question. The fact you even entertained it shows us you're unaware of one of those two things.
This will be 2012. Not an average 2008 landslide, and by no means a 2000 squeaker. I'll be sad to see the daily trump shitshow disappear when he loses, but people just don't have confidence in him to understand the things he needs for the job, or his ability to truly control himself.