Tony Vargas
Legend
In concept, yes. The former more than the latter, probably, in most cases, since the latter is necessarily reactive, while the former can be proactive and quite dramatic. But, the latter can play to certain character concepts and themes. Compassion, for instance.But why do believe that people like playing buffers and healers? That's totally not my experience.
Well, sure, it's not limited to healing, and it's better-balanced, overall.D&D 4e is the only RPG system/edition where I notice that interest in playing a leader is about as high as playing a class filling some other role.
OTOH, you could be. The Pacifist Cleric, for instance, was brought back by popular demand for folks who did want exactly that. Then there was the Lazy Warlord build that willfully didn't use it's actions to attack, even though the design team had very carefully made sure every leader could buff/heal and still attack every round.And the reason is easy to see: They don't have to be _dedicated_ healers.

You missed the whole CoDzilla thing, I take it?It's the opposite of D&D 3e where a cleric was hardly more than a buff-/healbot. In 3e we were basically drawing straws to decide who'd have to fill this unpopular role.
Part of the beauty of Roles was that they had different appeal and different kinds of 'glory' as a result of different (but balanced) contributions, and really gave players a wider range of style options. You see the glory of the Defender role, but a lot of folks don't, they see the Striker as having the limelight because of his big damage. Others find both Striker and Defender mere grunts, and consider the massive AE power and subtle strategic influence of the Controller far more meaningful and rewarding. Any, yes, some of us do like being the enabler and force-multiplier setting everyone else up.And in our 4e group, the defender is definitely getting the limelight very often. It's true that our main striker often evokes more awe because he's the one killing most of the opposition, but everyone realizes it's the defender's expertise that allows the striker to do so. The defender is also the one character that our DM is complaining about the most because it's so hard to scratch or disable him even temporarily.
My favorite Role was Leader, followed closely by Controller and the odd Defender build, and more distantly by Defenders in general, with Strikers well, striking me as positively boring - playable only if there's a really good character concept to RP and some useful non-combat pursuits.