The anime version of this arc was really brutalized, the original VN version is significantly better. This is easily one of the slowest question arc though, and I think the SOL scenes are just alright considering how long they last here. I'd say the point where they start investigating Rika's house is where this arc gets really good, but until then it's definitely sluggish (though I still liked it). This is one of Keiichi's dumbest arcs as well, but I give him some leeway. The phonecall with Shion towards the end is the first really great WTC scene, imo, and it stays pretty strong throughout the rest of it. The ending is really interesting for theorizing if you know nothing about the series yet.