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Because he was such an emotionless guy. Because he was such a nasty guy. Both. No emotion on his face what so ever. Although i actually did see a smirk or two during "At Worlds End". During the scene in At World's End before the big battle, Will and Jack switch places and Beckett quickly scoots over so Jack has to stand next to Davy Jones. When it shows Beckett, he had one big smirk on his face. Was pretty good i have to admit, but Beckett is probably my least favorite out of all the Disney Villains combined.
As for Gothmog? Well, look at the guy! His looks pretty much sealed the deal there.. The whole side-stepping the boulder didn't help much either. That and the fact it never showed him getting killed.
But i got used to him and he became one of my favoritest characters from the movies. As for how? I dont know. After watching the movie a few times i started to like him and then it got to the point where he was my second favorite from the movies(First being the Witch-King). Alas, by that time the Extended Edition came out and it showed him getting killed.
"Arg, he got killed. I don't want him to die now, i like him!"
As for Gothmog? Well, look at the guy! His looks pretty much sealed the deal there.. The whole side-stepping the boulder didn't help much either. That and the fact it never showed him getting killed.

"Arg, he got killed. I don't want him to die now, i like him!"