Sadly, I have to agree. I've been a frequent visitor to the site since 1999, and in that time, I've seen lots of ups and downs. I think things really culminated in a fever during the iOS vs. Android arguments three or four years ago when every article was clickbait to get the masses to chew each other up. I wouldn't be surprised if a lot of the "old guard" packed up and left during that time.
Since things have calmed down, Slashdot seems to be slowly sinking into irrelevance. I'm seeing a lot more conversation that almost mimics the comments of any CNN political article. I'm also seeing some terrible moderation -- flamebait being labeled as insightful and so forth.
From 2000-2010, I probably only modded down five posts. In the past couple years, I feel like I'm moddng down all the time. It's sad but this place used to feature high quality discussion. It just doesn't anymore. It's running on pure inertia. The only thing that keeps me coming back is habit, but I rarely read stories anymore. I just skim the frontpage like it were a news aggregator, then move on.
I'll keep doing so because of habit, but once the beta becomes the defacto version, I'll bow out. It was a great site with some good memories, but all good things must come to an end.