He's a nice guy other than the fact that he worries about little things.
He spends too much time thinking about every little detail, other than that he's a great guy.
この場合、次のような言い方ができますよ。
ーHe's a nice guy other than the fact that he worries about little things.
「彼は細かいことを気にする以外はいい奴だ」
to worry about little things で「細いことを気にする」
ーHe spends too much time thinking about every little detail, other than that he's a great guy.
「彼は細かいことをいちいち気にしすぎる以外はいい奴だ」
to think about every little detail で「細かいことをいちいち気にする」
ご参考まで！
カナダ 
