Before Anakin Skywalker fully became Darth Vader, he transformed into Darth Crispy. This is exactly what will happen to you if you don't take the high ground. Obi Wan would warn that you must always take the high ground. If Anakin would have listened, maybe Hayden Christensen wouldn't have had to suffer eight hours in a makeup chair to look like this. The only thing more uncomfortable than putting all that makeup on is actually getting burned.
If you didn't like Hayden Christensen's portrayal of Anakin Skywalker, but you'd like to see more Anakin, you should watch The Clone Wars series. A lot of it is about Anakin Skywalker and helps explain the events leading up to Revenge of the Sith. It's far more humanizing than the way they treat him in the movie prequels, so I'd definitely suggest it if you felt that Anakin was portrayed poorly.