Read through Gamespot's specifically...
"Shadow of the Tomb Raider adds so many more pieces to the formula of previous games, but there are also so many little things that it just doesn't quite land. The game's obsession with collecting crafting materials has only become more profuse--there are now 21(!) different items to gather--causing everything to seem less valuable and the act of gathering them to be more of a chore. The side quests are poorly paced, as each will lead off with roughly 10 minutes of fetch quests across the game's huge hubs and watching talking heads before getting to the meat of things, making it easy to lose motivation. The game has an option for immersive voiceovers which causes NPCs to speak in their native languages, but Lara continues to speak to everyone in English, which feels like a missed opportunity."
There are things it does better, sure, but there are negatives that didn't exist before.
Lets see here..
1) Rise's side quests were also a bunch of filler and fetch quests. So it's not a step back from rise, it's just a missed opportunity to improve things. Which is a fair criticism but it can't count as a regression from Rise if it also had a bunch of Ubisoft filler and fetch quests.
2) Okay, I personally liked crafting in Rise, and I prefer that it's expanded, but I see their point of view. Fair point.
3) The game has an option to let the natives speak in the native language. You can turn it off completely to make it like Rise. Or you can you can turn it on, which is a new option. Gamestop criticizes the game to not take it a step further, to make Lara interact with the natives in the native language. Fair criticism, but then again how can this been seen as regression from Rise, if that game didnt have that option in the first place?
All of these are fair criticisms. However only one of them is a regression from rise (and that depends on the way you look at it). The other two, as I said, are a missed opportunity to improve things further.
Two of those three negatives still existed in Rise. The second one is debatable. Infact for the third one, in Rise the natives in Siberia spoke completely in English, so this option is an improvement. Gamespot is criticizing the lack of further improvement, which is fair.