I am going to attempt to individually discuss some of these. Unfortunately this is the only post I have time to make for a while.
Strike the Blood is a show where the main character keeps getting into situations where he has to suck girl's blood to get more power. But it has to be a different girl each time (if I remember right?) and it doesn't work until the obligatory scene where they make him horny but are really embarrassed about it. Combine this with an astounding amount of deus ex machina (the show is basically "get into trouble, get new power, new power solves all problems, repeat" in the worst way possible), no really stand-out characters, and writing that gets annoying as **** ("no senpai this is our fight"
) and you basically have the show. It's formulaic
and annoying and basically characterizes the main criticisms people have both about ecchi anime AND about shows like DBZ without something really positive or unique to make up for it. There's almost no character development. It's repetitive
and predictable. The fighting scenes are boring. It's a bland over-sexualized harem anime with nothing to recommend it, and reasons to not recommend it, so your time is better spent watching something else. That is why people should avoid it. There are hundreds of harem anime out there that deserve it more and multiple people on this thread could even recommend much better ones.