Snape was a good DADA teacher. At least when you consider the content of the lessons. He didn't do stuff that was unusual for that year because in transfiguration and charms they did non-verbal spells as well.
Nonverbal spells were now expected, not only in Defense Against the Dark Arts, but in Charms and Transfiguration too.
Harry Potter and the Half-Blood Prince: Hermione's Helping Hand
The reason for DA in OotP was that they only acquired theoretical knowledge in DADA, no practical experience with charms. So to counter that they founded a club where they learned the practical aspect of defending oneself.
She paused, looked sideways at Harry, and went on, “And by that I mean learning how to defend ourselves properly, not just theory but the real spells —”
Harry Potter and the Order of the Phoenix: In the Hog's Head
There was simply no need for this anymore, because the foundation of lacking practical use didn't exist anymore.
We have no reason to believe that Snape's classes in lower years had unreasonable content.
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Best Answer
2 years ago
Why was there no Dumbledore's Army in the Half-Blood Prince?
In this year Snape is appointed as the new Defence Against the Dark Arts (DADA) teacher, and teaches, if my memory doesn't fault me, difficult non-verbal spells. It seems strange to me that Harry didn't recreate the DA. At first I thought he didn't want to annoy Snape, or to meet his anger, but Harry doesn't seem particularly frightened by Snape.
I just thought that, had the DA continued in Harry's sixth year, many of the former members could have greatly improved their dueling skills (as Neville did) and maybe the Battle Of Astronomy Tower could have been less bloody (Dumbledore would have died anyway).
I thought Harry didn't have the time, but thinking about that, he managed to successfully lead it in his previous year, with the OWLs, a couple of classes he eventually dropped before HBP (Care of Magical Creatures and Divination), and with the whole Voldemort-scar thing that gave him a hell of a year.
In the OoTP he didn't have the Quidditch training because he'd been banned, but in HBP he had more time he could use to tutor his friends. Maybe with several Death Eaters in Azkaban he relaxed a little, but he did know that Voldemort wasn't in prison. He almost seems to forget this.
He didn't even have to worry about being discovered, with no sneaks or Umbridge standing in his way. Maybe Dumbledore didn't want him to continue because he was afraid he could use his army to thwart Malfoy's plan? But Dumbledore had already arranged his death with Snape and had already told Harry several times not to worry about Malfoy. Harry, anyway, asked Dobby and Kreacher to keep watch on Draco.
I'm relatively new to the Harry Potter franchise, I've read the books a couple of times (I have seen the movies, but I don't particularly like them after Goblet of Fire) and I apologize if my question is stupid.