It is. I think most 1-CHIPs are too bright by default.
I have 11 systems hooked up to the OSSC at the moment and nearly all are a little too dark by default. The AES I got is an extreme case, but for all the others you couldn’t even tell unless you do a direct A/B comparison. But it’s reasonably obvious when you come from something like a PS3 and the immediately switch over to the SNES. Then you can just notice that some of those logo-on-white-background type screens are just not quite as bright as the TV gets with a HDMI console and proper 255,255,255 white. For now I bumped the gain a little bit on my default profile and quite severely for the AES, looks really good.