This is a list every single major problem BD that Sentai (and Maiden Japan but it's the same production people) has released so far:
Penguindrum (both parts) - 1080i (JP BDs are 1080p), artifacting
Bodacious Space Pirates (both parts) - 1080i (JP BDs are 1080p), artifacting, missing lines in the dub
Horizon In the Middle of Nowhere - Episode 7 has severe aliasing for 10 minutes
Tokyo Magnitude 8.0 - 1080i (JP BDs are 1080p), artifacting, JP track of episode 7 has this same audio problem as Kids
The World God Only Knows Season 1 - JP track of episode 12 has this same audio problem as Kids
Dream Eater Merry - 1080i (JP BDs are 1080p), artifacting
Kamisama Dolls - 1080i (JP BDs are 1080p), artifacting
Fate/Stay Night (both parts) - artifacting, 1080i is correct for it though, one of the discs of part 1 is missing chapter stops
K-On Season 2 Part 1 - JP track of episode 11 is muffled and louder than the other episodes
Canaan - artifacting, 1080i is correct for it though
This Boy Can Fight Aliens - artifacting, I don't know if 1080i is correct for it
Legends of the Dark King - lossy Japanese audio, supposedly it looks bad but I can't confirm that
Appleseed - lossy English and Japanese audio
This isn't counting lesser issues like typos/errors in the subs, mistiming of the subs and chapter stops, etc. that numerous releases have.