On paper, a Lenny Kravitz show on the heels of the 20th anniversary re-release of his debut album, Let Love Rule, is an intriguing prospect. Add in a setlist that has but one song released after the year 2000 and I’m downright excited. So why was Tuesday’s show at the Warner Theater a bit of a dud? Pacing, mostly. Kravitz managed just 13 songs in a two hour span in a set that started and finished strong but veered eerily into “Jazz Odyssey” territory in between.