ST. PAUL — Kiss headlined St. Paul’s Xcel Energy Center Monday night, Feb. 24, for what may well be the final time. And judging by their uninspired performance, that’s probably for the best.

The costumed rockers kicked off a three-year farewell tour last January and played the Target Center in March. The show at the X was nearly identical, right down to its decidedly unrocking booking on a Monday. The band did make a few minor changes to the set list — they added “Tears Are Falling” and “Parasite” — but pretty much everything else felt the same, down to Paul Stanley’s stage banter.

Speaking of Stanley, when the tour began, some fans accused the 68-year-old of lip syncing part of the show and, at the Target Center, it did indeed appear he was not singing live at times. When Kiss took the stage with “Detroit Rock City” at the X, Stanley’s voice sounded buried in the bass-heavy mix and it tended to stay there the rest of the night. If Stanley was lip syncing, he’s gotten better at hiding it.

Of course, Kiss has always been more about explosions, spitting blood and shooting flames than serious musicianship. Purists have long dismissed the band as crude and comic book-ish, but that’s the point. And in earlier days, Kiss usually delivered a spectacular and fun night of big dumb rock anthems and special effects.

But just like in March, Kiss felt tired and detached Monday and far less invested in earning the title of the hottest band in the world. Yeah, 70-year-old Gene Simmons wasn’t afraid to ham it up and play the smirking demon, but Stanley seemed to be sleepwalking at times. More than ever before, the hired hands — guitarist Tommy Thayer and drummer Eric Singer — seemed happy to let their bosses get all the attention, even during their own overly lengthy solos.

Hardcore Kiss fans are legendary for their devotion to the band, but more casual followers appear less interested the longer this farewell tour drags on. Earlier this month, fire-sale $35 tickets — in seats close to the stage — showed up on Groupon, and Ticketmaster was selling blocks of four tickets for $21.50 each. Still, only about 10,000 folks showed up, with the X’s 200-level dark for the evening.

David Lee Roth, who has kept a low profile since the last Van Halen tour ended in October 2015, opened the show. And, wow, he was a mess. As anyone who caught the reunited VH live will tell you, Roth takes a shall we say unique approach to his vocals. Monday, he barely sang at all, letting his band members (or backing tapes) do all the heavy lifting while he occasionally yelped over them.

The 65-year-old skipped many choruses altogether, including his solo hit “Just Like Paradise” and VH’s “Runnin’ with the Devil.” He mumbled through “Just a Gigolo/I Ain’t Got Nobody” and spoke most of the lyrics to “Jump,” the VH smash that helped make Roth a star.

The once acrobatic Roth tossed in the random leg kick here and there, but spent most of his time mincing around the stage and throwing his arms in the air like an over-the-top preacher. His band — which features two guitarists, one of whom is Al Estrada from the VH tribute band Eruption — did the best they could, all things considered, but this was a tough one to watch. Roth is also doing a Las Vegas residency in between dates with Kiss, and my heart goes out to anyone who has to endure an entire headliner-length Roth show.