Leno has always defined "bland" to me - both his monologue and his interviewing skills. The funniest things on his show were the newspaper headlines and the Jaywalking skits, which weren't about him.
edit - RIP, Ed!
Not only were those bits not about him, they were unoriginal. Jaywalking in particular was a direct ripoff of something Howard Stern had done years before.
RIP, Ed.