One of the most unjustified review bombings in recent years, IMO. The game is very much a standard Bethesda game, and is fine. Mods and DLCs are what people buy Bethesda games for, anyways.
Don't get me wrong, Bethesda themselves are very mediocre game devs, but their specific style of game lends itself well to modding.
Starfield is just as mediocre as Skyrim and Fallout 4, everyone who made Morrowind great is gone, Bethesda games ride on the success of their modding communities.
New Vegas has no technical issues if you mod it properly these days!