I agree completely with the transfer window being bad, first of all. But I think with Lucho's squad, he can't do much better than he has already. He's rotating because he's trying to find a system that gets the best of our players, since, you know, they're not playing at their peak. Should he maybe stick with a formation/lineup for a few games? Maybe, but we don't see the training sessions, so we don't know what he sees. Our squad is very mediocre, with Messi, Neymar, our GKs, and maybe Pique the only players playing at a proper level. Suarez's game has dramatically decreased from last season, Iniesta hasn't recovered from injury yet, Busquets is in mediocre form, Alba can play better... There's only so much a coach can do, players need to realize that they need to improve their game. As for him saying Getafe is a strong team, what was he supposed to say, "oh yeah getafe suck my tactics are such crap"? He played practically the best lineup possible, his only logical sub was Munir, who he put in... The midfield didn't create anything because they're all not in great form, and so couldn't pick their way through ten defenders. Real are steamrolling through the league because Ancelotti found a system that works for him, in his second season, and all of their players are playing well. Last season it was Real who were sucking in the league and losing to random teams and Ancelotti experimenting with his lineup, it takes time for a coach to get their team playing well, especially given how ingrained our style and philosophy is.
As for me being an Arsenal fan, the vast majority of Arsenal fans want Wenger out the instant we lose a handful of games, I put faith in him not because I'm an Arsenal fan but because I generally put faith in managers, and I tend to be right, Ancelotti took a season to get Real going, Mourinho took a season to get Chelsea really going, Van Gaal hasn't been that much better than Moyes (he has been better, but the squad is also a whole lot better)... Managers don't have nearly as much to do with the team's success as people seem to think, a big part of it is the players and when they don't play particularly well you get games like today's.
For a club that biggest achievement is loosing CL final and winning FA cup
There was the whole Invincibles thing, but whatever