Previews raise some concerns.
For instance, Eurogamer:
"Now onto the bad. Shadow of the Tomb Raider is the end of Lara's origin story, and so I accept there needs to be a tonal consistency across the trilogy, but by god the game needs to cheer up a bit. Shadow of the Tomb Raider is super serious - relentlessly so. Lara herself is one-note - the thing she is talking about is incredibly important and we'd better understand the gravity of it at all times. Shadow of the Tomb Raider is grimdark personified. Lara has clearly worked through any lingering remorse associated with stabby murder she felt in the previous games and emerged a deadly killing machine. Now she stabs with nary a care, willy nilly, in the chest, in the back, in the neck. More so than ever, she is a Ubisoft assassin, an Agent 47, a Tom Clancy super soldier.
"I've come to accept Lara killing her way through hundreds of bad guys as she works to save the world. Naughty Dog's Uncharted series suffers from the same ludo-narrative dissonance as you switch from bloody shootout to emotional cutscene as the wise-cracking Nathan Drake and I still love those games. But the upshot of Tomb Raider's deathly tone is Lara feels empty, as if she has no personality. Playing the demo, I longed for the return of Core Design's imperious Lara, then pondered what a Tomb Raider game might look like starring an older Lara Croft. I'll soldier through Shadow of the Tomb Raider with this current version of Lara Croft, but I doubt she'll have made much of an impression by the game's end.
"And finally, the ugly. The demo I played, which involved a stealth combat section that triggers after you lift the Mayan artifact from its home and must escape the crumbling ruins, betrayed the build's shaky foundations. Movement was a tad janky, the shooting a little erratic, the hitboxes a bit all over the place. I encountered a few bugs and on occasion the camera decided to embed itself within my troublesome cover. Eidos Montreal has a few months to sort a lot of this stuff out, so I'm not calling for an evac just yet, but I remain convinced that my favourite bits of this game will be those when Lara is on her lonesome in some mysterious tomb, pulling the odd lever and jumping from pillar to pillar."
PC Gamer:
"However if this hour is representative of the rest of the game then go in expecting a linear rollercoaster with some nice views and a score somewhere in the 50s or 60s from PC Gamer. The last two games were much more than that, and it seems likely that Shadow of the Tomb Raider will open up and give us the exploration, intricate puzzles and combat that made the other two games quite good. I can only judge based on what I've seen so far, and dramatic corridors powered by quicktime events don't cut it in 2018."
Previews said good stuff as well of course, but negative comments in previews are rare and they catch my attention. Others are remarking on it, too. It's certainly possible that some of the technical issues will be sorted out by the time the game is released. I'm more concerned about the overly dark, grim tone and the lack of interesting character development.