Absolutely not. While the original SP gain was interesting *on paper* it was disastrous in practice.

Why? It actually encouraged NOT to kill the monster, and to try and make it last as much as possible to get more SP. It also discouraged the use of any skill that didn't directly result in SP gain (for instance shock spikes and the like).

Any system that discourages *winning* in a game, and discourages the creative using of one's tools is utterly flawed at it's roots.