My complaint is that the Titan didn't turn out to much of a threat as threats go, especially given the buildup. The Fomor killed more people in when they gassed a city to get at a hospital, no Eye needed. Where's the sense of menace? Where is the fear? Jim actually has Marcone rag her about it.
I don't disagree with you. As villains go, Ethniu was something of a letdown. However, I felt that King Korb was an even bigger disappointment. It's obvious that his henchman Listen is a lot smarter than Korb. Also, I don't remember if it was in Peace Talks or Battle Ground, but there is a scene where Harry asks Mab about King Korb, and her reply is that Korb is smarter, tougher, and more devious than Harry; or words to that effect. The problem is that Korb never comes off as any of those things.
Though we didn't see King Korb fight, because he is the King of the Fomor I can picture Korb as being bad news for a mortal wizard to go against one on one, but that's it. Aside from making himself Ethniu's slave; which is a less than impressive power move for a King to make, Korb came off as a complaining, blustering and blubbering idiot. I found it hard not to picture Korb as an evil version of Boss Nass; the leader of the Gungan's in The Phantom Menace.