Oooh, I like this game! I agree with you on most, will just add comments for any different thoughts I have to yours.
Goalkeepers
Glykos - Rating 3
Brkic - Rating 3
Vellidis - Rating 3 - no better or worse than Glykos, who presumably is no better or worse than Brkic. One of Vellidis or Glykos may be part of this "clique," and we really don't need three starter-level keepers...time to let some guys go.
Defenders
Matos - Rating 4 - I think he's probably our best player (yes, even slightly better than Rodrigues).
Leovac - Rating 3 - Compared to Matos, everyone's going to look like a turd. Better than Tzavellas, only a Matos-level guy can seriously be considered to replace him.
Varela - Rating 3 - Average so far. Not sure if it's just him settling into the team. Has everything he needs, physically.
Crespo - Rating 3 - has made some dumb mistakes, but better than I thought he'd be. Nothing amazing, but seems to have a good attitude. Will be nice to see him pairing with Varela.
Tzavellas - Rating 3 - Lots of passion, but not worth the yearly drama. Can play both positions. Replaceable.
Malezas - Rating 3 - Not worried when he plays, doesn't have the physical attributes of the two new guys, but I like him.
Kitsiou - Rating 2 - Regressed. Will be easily eclipsed by Konstantinidis next season, I think.
Giannoulis - Rating n/a, since he's played all of two matches this season. Needs to get loaned, especially if we're looking at a new LB.
Midfielders
Canas - Rating 4 - Very good player. Completely tireless. Calm, cool, collected.
Cimirot - Rating 3 - I actually think he was better last year. Paired very nicely with Charisis.
Shakhov - Rating 3 - playing as a CM, he's fine - and there are flashes that imply he's even better than he's looked so far. Looks lost when he plays as an AM.
Charisis - Rating 2 - Regressed. Very talented, but has started to worry me.
Pelkas - Rating 2 - Another player who's gone backwards.
Biseswar - Rating 4 - the squad looks TOTALLY different when he plays. Fantastic passing. He desperately needs to get fit, we need him badly.
Forwards
Rodrigues - Rating 4 - We have no superstars on this team, but he's very impressive. If he were less wasteful, I'd peg him as best on the team...but Matos is a bit more consistent in his role.
Mystakidis - Rating 2.5 - Similar regression as the other Greek players, but he gets some game time. When he's on, he's wonderful.
Djalma - Rating 3 - I'm on the fence about him. I talk a lot of trash about Campos, but when he's on, he offers that right wing something completely different. Remarkably agile for someone who seems to be a solid block of muscle.
Klaus - Rating 1.5 - We were just saying a few months ago that "this year he's gonna be fed properly." Well, either that hasn't happened, or he's just become garbage. Should be sold asap.
Koulouris - Rating 2 - As Blackhawk says, he's essentially Klaus without the tattoos. More upside for Koulouris - if we sell Klaus, then keep him. If not, then us hiring a new striker this next window means he'll NEED to be loaned.
Pereyra - Rating 3.5 - I agree with what you said about him being tricky to rate. I think he's better than most of our attacking players, and he can definitely play anywhere along that front line. I have a feeling that he might be related to the troubles Ivic spoke of.