From the early 1980s until their breakup in 2004, Guided By Voices built a reputation as one of the great live acts in rock-and-roll. Armed with some of the best material in all of indie rock — thanks to frontman Robert Pollard’s inspired, ultra-prolific songwriting — GBV’s various incarnations consistently enthralled its loyal fans with dynamically shambolic, three-to-four-hour marathon performances fueled by massive amounts of alcohol. Expectations were high as GBV played a sold-out 9:30 Club on Thursday night with its recently-reunited “classic” (1993-96) lineup featuring Tobin Spout and Mitch Mitchell on guitar, Greg Demos on bass and Kevin Fennell on drums. The Ohio-based quintet delivered a solid, if surprisingly brief, two-hour performance that featured a sterling set list, but — if only because it rarely achieved the exhilarating heights of past GBV extravaganzas — ultimately felt like a slight disappointment.