Never seen a boring SSPU show, but I'm a pretty big fan and familiar with the music. I suppose if you had never heard of them, were generally sKeptical about opening bands, and aren't that patient (I think if you're looking for Snow Patrol/OKGO hooks, and general pop-i-ness then new soundscapes aren't your thing) then they could be boring. But if you DON'T think Bardo Pond, Sonic Youth, and Big Sleep (non pun intended) are boring then SSPU will be right up your alley as well. And if I was using my mom as a barometer for what's hot and what's not...well. No slaggin moms, she took me to most of my early shows (Zepplin/Judas Priest Kingdome 77), Commdores/Earth Wind and Fire Paramount 78, even was groovin in highschool Madonna/Beastie Boys Paramount in 85 got me backstage passes) but still.
Bottom line, I think this will be pretty good, even worth dealing with the smokestack and talking that happens at every baltimore venue:)