All due respect to the very young people here, for whom Kyle IS the GL, but: frankly I always found Kyle about as interesting as watching paint flake. But then, my introduction to him--and most of what I knew of him till, really, the last two years--was via Morrison's JLA, in which he was always talking like what Morrison thought American young people spoke. And I found it irritating.
Also? Always hated that stupid overdone mask.
That said, once he was confined to GLC and was part of an ensemble? I could deal with him just fine.
Not that I'm so much a Hal partisan--in the sense of "liking" him. But while I don't "like" Hal, I do find him--and Guy--more interesting than Kyle.