i agree to a certain extent. yes, his tactis and team selections has been very questionable so far and he deserves criticism for that. but as you said these players are capable of a lot more and in my opinion they're just as guilty as roy.
That's a popular opinion, but it's one I disagree with personally.
Firstly, it's the manager's job to get the best out of his players. The buck stops there.
Secondly, it looks to me like the players are doing what Roy is telling them to, or at least trying to. He hasn't been standing on the sidelines yelling at them to do things differently has he? I really think this lackluster play we're seeing is more a reflection of the tactics and general approach than it is the players. That's not to say the players couldn't be putting in more effort (and we saw some pretty lackluster performances last season as well of course), but see the next point.
Thirdly, Roy is by the looks of it one of the worst motivational managers of all time. Seriously. Before the Northampton game he was telling the players he thought they might not be good enough and if they didn't perform they'd be out the club. Today he's basically saying the players aren't good enough and he's only trusting them until January because he can't do anything about it until then! What kind of idiotic management is that?
If you were a player, and your manager continually told you that you're basically not good enough and showed zero confidence or belief in you, if he seemed to have no idea what he was doing, and if he was making you and your teammates play out of position in awkward and uninspiring formations, would you find that:
a) Hugely inspiring. You'd die for such a man.
b) Totally demotivating.
I'm not saying I don't think the players shouldn't be getting past that and putting the effort in regardless - they are playing for LFC at the end of the day after all - but I can see all too easily why they might be finding it difficult to motivate themselves to play for Roy. The man's a chump.