With arguments like this you've got to either admit that Moyes was a genius or that Martinez is hopeless. One of these things has to be true to explain the drop in league form. Instead the lazy narrative comes out of Moyes as a hoofball merchant scraping 7th and poor Martinez being left with a rubbish squad.
To answer your question in the way you want it answered (a logical way would be to say they finished 7th therefore they were all top 7 players):
Baines - league's best LB without doubt
Coleman - in top 2 rbs without doubt
Jagielka - easily one of the league's top CBs
Distin - top 7 quality
Gibson - top 7 quality when fit
Fellaini - top 7 quality
Mirallas - had the ability to play in any team at that time, a huge talent
Naismith - top 7 quality
Pienaar - top 7 quality
Osman - top 7 quality
Jelavic - top 7 quality
I think his problem has been that he has replaced the creative players in the side with players of lesser quality. Gibson replaced by McCarthy, Pienaar - Cleverley, Mirallas - Deulofeu. Fellaini - Barkley.
Players in their prime were replaced by players not good enough or by young players. In each case though the performance level has gone down and with it the consistency of the team.
The failure to adequately replace Pienaar and Osman was crucial as they made the team in the first season tick. That link between the possession based middle two and the explosive front two. That's not been there since and in a desire to get it back we've brought centrebacks outoif defence, pushed full backs right up the pitch, and played wide players who cannot defend.
Moyes was a very good manager. I don't think I've ever stated otherwise (sober anyway!). I didn't like the brand of football though, that's just me.
From those players you listed, let's talk about his second season, the beginning of his "failings".
Fellaini had gone purely because he wanted to.
Pienaar- previous season stayed relatively fit.
Baines- struggled for consistency, had a niggling ankle problem
Coleman- regular little problems
Howard- became awful overnight.
Distin- same
Jelavic- already gone because he was nowhere near top 7 quality. Couldn't hit a barn door.
Gibson- never fit
Naismith, sure, played well.
Kev- good season.
So, not being arsey, it seems clear that at beginning of season 2 he thinks he has an experienced back 5, never injured, and has retained his 15+ goalw striker. He also has a playmaker at LM who can help against more defensive teams with osman as back up.
That second season went horribly wrong and with limited finances being spent on Lukaku, I don't know what he was expected to do about it?
This summer he potentially has an open cheque book. No more spreading funds. Go out and buy quality.
Id like to see him given the opportunity, personally.