He's only played 5 games ( I think ) in premier league. One of those games he was very impressive in. In the others he was no better / worse than anyone else, so I am not seeing enough to make me hate.
Digging him out over anything at this stage is counter productive. If the negativity gets from the stands to the player it is not going to help him or us. We must try to keep a collective open mind and give him a chance. It's hard to do, but do we must.
His Newcastle form gets thrown at him a lot but he made 70+ appearances before last season even started and he was, from what I recall, impressive on the whole, who's to say we won't see more of that player than the guy who perhaps struggled in a shit situation with a shit team last season ? Bigger players than him had had the Geordie Mafia given them unwarranted gib from the inside of that goldfish bowl, what they say about anything I would give a massive pinch of salt to.
Even in the Champions League game sissoko was not any worse than anyone else, and from what I recall he always had his head up and wanted to get the ball going forward, not everyone was doing that & did he not have that run and shot that might have changed the outcome ? I did not see anyone else doing that. That's not to say one run saves anyone from a dreadful performance, but it would indicate a level of ability is there.
Give him time. If he's poor until May then we know a stambouli mistake has occurred at which point you jog the guy on. Before than, chill out and support the shirt he wears ( if not him )