Heh, well, as even the TV Tropes article states, the "Butler did it" solution is a pretty ironic example of something that was never a real cliche to begin with, since apparently relatively few mysteries were solved with servant culprits.
Anyways, Umineko certainly is complicated ... mostly owing to it's very, um, post-modern nature. The mysteries themselves aren't very difficult at all, though. Assuming we're talking about the gameboards, anyway. Acknowledging that this sounds terribly arrogant but, I'm not at all a veteran of the genre, but my theories for EP1 and 2 were pretty much spot on. I was only missing a reasonable motive, which wasn't even
hinted until EP3, and arguably doesn't exist at all.
In other news, reeeally wish Knownomore would invest the time in a truncated transcript. He doesn't even really have to solve EP5, does he? There isn't much of a mystery to account for, and he probably uses those parlor scenes as a stake against Shkanon, wham bam.