This is definitely true. Several times yesterday he used that little feign-feign-shimmy move whilst standing on the spot before playing the simple pass he was obviously going to make anyway. This offers nothing aside from slowing down the tempo, which can sometimes be useful but not particularly when Ross is doing it. It seems like he has an urge to prove himself every time he has the ball, rather than have the confidence to do the simple things when appropriate. You can tell the rest of the team don't really know what he's going to do: see the weirdly ambivalent movement of players around him as they wonder whether he'll pass or if they'll need to jump out of the way of one of his power-runs. Off the ball he should press a little harder and utilize his size.
I wonder if finding a blend of Martinez's 'express yourself' and the conservative Hodgeson-Moyes approach of getting him to consider the broader consequences of his game might in the long term be best. It doesn't seem like he's fully aware of the requirements of his role, and sometimes too much freedom can be unhelpful. People have expressed the worry he'll have his 'ability coached out of him' or something but the more he plays as a individual the more he becomes a luxury player that the rest of the team has to carry and compensate for, which should be the antithesis of Martinez's ideas.
Personally, I'd like to see him play deeper as a box-to-box midfielder in the not too distant future. It requires more responsibility, of course, but I actually think Ross should be given more responsibility and not be coddled with these 'best in a generation' and 'of course he'll lose the ball sometimes' comments. He has the potential skill set to control a game, and the inexperience, naivety and individualism will only diminish if he understands he has to remove them and not shrug them off as a by-product of his occasional brilliance.