I'd say it's not surprising. The Rating had alot of time to develop.
A Galaxy-sized playground originally advertised as a huge Sandbox and "Blaze your own Trail"...
...but only a mere handful or two of things to do in it and definitely not a Sandbox. Far from it.
"Play the way you want*" ... "* but Frontier Developments(tm) reserves to retain the right to deny, override, modify and/or control anything at anytime".
Kinda leads to high expectations, followed by a harsh awakening, doesn't it?
Highly visible Scripts, Assets visibly spawned out of thin air (or space dust) to no end, fake Economy and mechanical/digital Mechanics with minimal variations to "more of the same".
Latter hitting Stellar Forge the hardest. Seen a few hundred Systems, basically seen them all.
MMO? Balancing? Long-standing Bugs or sub-par Design Decisions? Shallow Gameplay? CQC? MultiPew? Crime&Punishment? Communication (lack thereof) from FDev to even its most loyal customers? I just stop here.
The list if issues, toxic design/management decisions, bugs and poor Gameplay design is long. Very long. Too long.
I don't say a 6/10 is "fair", "right on" or "wrong".
I only say : it's not surprising.