Been using both blues and browns since around February. Browns take a lot of getting used to! I had the same reaction at first – they just felt linear, and almost unbearably light. After years of pounding away on rubberdomes, I was slamming the keys so hard that it was impossible to feel the tactile bump. (My first ever computer, that I got around ~1990 used Cherry linears -- I never realised until this year that the keys had mid-travel actuation, as I went over and tested this out on a machine I still possess. They're also unpleasant enough to put me off linear forever.)
If I get into the swing of browns, though, they're very pleasant to type on and the tactile feel comes across nicely. You just have to be gentle with them.
I do find the tactile mechanism to be quite scrapy in browns, and this doesn't wear off like someone here said it would. If you press browns too lightly you can hear and feel the friction in the wedge that provides the tactile bump.
For whatever reason, although blues have a stronger version of the same mechanism, they're free from both the scrape sound and spongey feel of browns. The click is, though, a little irritating, whereas blue ALPS sound a lot deeper. I don't know whether my Tulip 286 keyboard is complicated or simplified blue ALPS, but it's a nice keyboard, and my first ever clicky. I'm getting a Fukka clicky in the new year, will be interesting to see how it compares to blues.
The main video on YouTube of the Matias Tactile Pro 3 also has the same deep metallic ringing that I get off my FILCO brown board. Again, seems to be more of a brown thing than a blue thing.
Blue or brown? Probably blue, but they're a bit noisy for an open plan office, and browns are very enjoyable if you can adjust to them, and the lighter tactile feel comes into its own.