Taven probably the worst ROH Championin ROH history along with a 50+ year old PCO and Xavier. The ROH title kinda went to shyt after they had Jay Lethal drop it to fukking Matt Taven. After Taven it went Rush, PCO, Rush (held it for 498 days with only three successful title defenses), Bandido, and Gresham finished as the champ before ROH effectively went under.
Taven mostly beat a bunch of mediocre or worse wrestlers during his reign. Took the belt off Jay Lethal in a three-way with Marty Scurll and his successful defenses were against Flip Gordon, Jordon Aries, PCO, Mark Haskins, Tracy Williams, Jeff Cobb, Jay Lethal/Kenny King three way, Marko Estrada, Alex Shelley, JT Dunn, and Volador Jr. Then he lost it to Rush.
As someone else said, you can pretty much point to the moment Taven won the ROH title on the ROH/NJPW G1 Supercard show in a sold out MSG as the moment when ROH began their death spiral. They really only had one legitimately good PPV after that, and that was the final one before the shutdown. Then the All In PPV they helped put together with the Young Bucks and Cody that led to the formation of AEW was like a long, drawn out choke hold that they eventually tapped out to last year.