For what it's worth I don't think Brendan is a great manager, and Saturday showed that.
He doesn't have the perspective to see the forest through the trees. He uses an 'if it's not broke don't fix it' approach to team selection. The same team got a point against Arsenal so lets pick them again. Put it quite simply we didn't need Lucas on the pitch in a game where we would have most of the ball, Moreno should've come in for Gomez as we have had nothing down the left in four games now, and his decision to justify the Lovren purchase was always going to result in something like this.
Compare him to someone like Rafa for example. He sets up his team every game with the opposition in mind. He analyses every flaw that his team could exploit, and considers how they could exploit his teams weaknesses. Everyone knew what West Ham were going to do on Saturday based on their game against Arsenal. They were going to look for an early goal, probably from a defensive error, and then park the bus for the rest of the game and hit us on the counter. We then give away an incredibly cheap goal and have no reply to it, when we should've been keeping the game cagey for the first 20 minutes or so. Chelsea did exactly the same sort of snatch and grab against us to stop us winning the league, and two seasons later we're still falling for it. We have no plan B when a team comes to Anfield and plays us on the counter.
I think Brendan likes to take the 'let the opposition worry about what we're going to do' approach to matches like West Ham at home. It's ok when you've got a team like Ferguson's United, or players like Suarez and Sturridge up front, but the truth is we aren't good enough to play like that. For the record I think he would win the league in style with Manchester City's squad, but I don't think we'll ever be that strong up front again.