Board Thread:Dark Souls/@comment-107.201.48.44-20131102034053/@comment-11227880-20131102052827

but to answer your question too,

the elite knights is in no way overpowered, it certainly is 'iconic' so that you look like Oscar of Astora, but you need like 37 end to fast roll in full elite knights and it provides above average defenses. it is certainly worth using, and used very openly and constantly in pvp (consistently mixed with other armour pieces) but the bottom line is

Yes, It Is A OK to use this armour.

your friend mightve been thinking of cross-wearing armour sets because this set does make pretty good builds such as the Brandon Build, but thats all there is to it. Your friend should check his sources, imo they might be a bit sketchy