Echoing the general sentiment that if it’s a well-known studio, you’re probably safe backing it. If it’s not well known, pay close attention and do your research.
I’ve backed many games on Kickstarter/FIG/etc. I’ve had pretty good luck with indie devs I’ve backed, but every one of them went past the expected delivery date (to be fair, pretty much every major studio project also misses the deadlines, just generally by a considerably smaller window).
Christopher Bischoff, who did Stasis for example, went way beyond his expected release date for that game, but he did release it, and it was a good game which also got decent reviews when released to general public. He also did a sequel and an unrelated game based on South African mythology called “Beautiful Desolation”. Every one of them ran into scheduling issues, but all got released and were full games.
BT4 was done by inXile (founded by Brian Fargo, the original founder and former CEO of Interplay) and while it was released, was a bit less than promised, a fairly buggy mess, and overall a disappointment particularly when compared against Wasteland 2 (Kickstarter) and Wasteland 3 (FIG) which were done by them as well and were far more polished. (They are now owned by Microsoft.)
Pillars of Eternity (nee Project Eternity on Kickstarter) and PoE 2: Deadfire (FIG) both by Obsidian (founded by the team behind Fallout 2 who also bolted from Interplay) were polished and what were expected. (They are now owned by Microsoft.)
(On a side note, with Microsoft now owning the studios that spun off from Interplay as well as Bethesda it’ll be interesting if they somehow merge Fallout and Wasteland into each other, since Fallout came into being because EA owned the Wasteland name and wouldn’t release it to Interplay for a reasonable sum at the time. Brian Fargo would later snatch it up as CEO of inXile after EA let the rights expire.)
Divinity: Original Sin 2 by Larian Studios was successful. Larian which had made Divine Divinity and the first Divinity: Original Sin decided they wanted to make D:OS 2 a more ambitious effort so that’s why they crowdfunded it. (Baldur’s Gate 3 was not crowdfunded, incidentally.)
The remake of System Shock was also successfully crowdfunded and released.