I don't know if I would call Tenchi GXP bad, kind of stupid maybe but not bad. It does not take itself very seriously at all but then again, I think that Toonami needs at least one silly show going in order to keep the line up balanced.
For some weird reason Inuyasha still seems to be a good fit even though it is nothing but reruns...
Eh...Episode 10 of GXP was actually very good since Kiriko went off on everybody. Seina even stabbed a guy! But for a show on an action block, it's really lacking in action, plus it's not all that funny. There are several good action/comedies out there that have plenty of action but are funny when they're supposed to be. It's not necessarily a bad show, but it's a questionable choice for an action block.
InuYasha is a great show. I think most people are happy with it.
I've watched almost an entire block of Toonami every Saturday for the last several weeks (although I've yet to stay up long enough to see Inuyasha, I usually get tired and pass out right around 4:00), and I don't really like most of them personally. Fullmetal Alchemist: Brotherhood is amazing and Tenchi Muyo GXP is pretty funny sometimes, but the rest are pretty boring IMO. I wouldn't mind seeing something different in the lineup. Also, I don't mind Thundercats and Sym-Bionic Titan, but are they even anime?
Samurai 7 has 3 episodes left. Sym-Bionic Titan has 4. And ThunderCats will end shortly after those. We could be seeing several new shows if Titan and ThunderCats don't rerun. (Though, FLCL has been confirmed to come back at some point.)
Toonami isn't an anime block, so ThunderCats and Sym-Bionic Titan fit. It's about "action cartoons", not strictly anime. (Remember, they ran several Batman shows, Justice League, Teen Titans, Megas XLR and Samurai Jack) Though, I do believe ThunderCats was animated in Japan, hence the anime-like character designs. Sym-Bionic Titan is a Genndy show....'nuff said. And last night's flashback ep. of the destruction of Galaluna impressed everyone on Twitter.