Aoi Kurenai
Mad Skillz
Tiga, Dyna, and Gaia all aired in prime time, so they're naturally going to attract higher views. The spot they aired in was the predecessor to what became the coveted spot for anime series for a good seven years or so.
The whole thing with Nexus is that it was supposedly bumped from its original time slot for a Gundam anime and was specifically crafted for an airing time when they assumed older viewers would also be watching. While Max improved upon Nexus by a full percentage point, it doesn't seem like it actually aired against any other anime or tokusatsu in the same time spot, at least none that I can see, so it probably could have done better, but that ratings bump means it brought back a lot of the viewers that Nexus lost.
Mebius is somewhat harder to gauge because it was moved to both a different time slot and day. It dropped two tenths of a point from Max which...isn't too bad. (and it was also a good ten episodes longer) Morning anime and tokusatsu generally have higher ratings than anything airing in the afternoon where Mebius aired. And I think it also says a lot that these days the time frame Mebius aired in is known as the successor to the coveted anime prime time spot that the 90s Ultraman aired in.
So all in all, the only one of those shows that did bad was Nexus.
The whole thing with Nexus is that it was supposedly bumped from its original time slot for a Gundam anime and was specifically crafted for an airing time when they assumed older viewers would also be watching. While Max improved upon Nexus by a full percentage point, it doesn't seem like it actually aired against any other anime or tokusatsu in the same time spot, at least none that I can see, so it probably could have done better, but that ratings bump means it brought back a lot of the viewers that Nexus lost.
Mebius is somewhat harder to gauge because it was moved to both a different time slot and day. It dropped two tenths of a point from Max which...isn't too bad. (and it was also a good ten episodes longer) Morning anime and tokusatsu generally have higher ratings than anything airing in the afternoon where Mebius aired. And I think it also says a lot that these days the time frame Mebius aired in is known as the successor to the coveted anime prime time spot that the 90s Ultraman aired in.
So all in all, the only one of those shows that did bad was Nexus.