The Spaniard hails his former Everton team-mate, who scored against the Gunners to save a point when the two sides met in a 1-1 Premier League draw on Wednesday
The Toffees star's strike was his seventh of the Premier League campaign and his Gunners counterpart, a former team-mate at Goodison Park, explained the challenge of trying to deal with him on the pitch.
"Fellaini is one of the most difficult midfielders to play against because of his size," Arteta told reporters.
"You don't normally come up against players like that in that position.
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"When he's used in that forward position around the box it is much more difficult to play against him.
"For me, he is much more efficient playing there than when he is deeper. I have seen a tremendous improvement in Fellaini, especially in that forward position."