I like him too, though the geometry stuff feels to me like more of a novelty (not that I've bothered to go deeply into it). What I like is that the consequence of his idea of separate manifested things being attributes of a single substance is that there becomes just this endless variation of individuals where each is completely unique, each one equally itself, with no model to compare them to. No clear lines therefore separating one type of human from another, nor man from woman, nor even, ultimately, human from non-human. Obviously the last one gets you into some ethical problems. In either case it's clearly from here that Deleuze takes off. Rather than "what is it?", the question is "what can it be?". Nothing is for an individual the right thing to be except just what it is.
Another objection to this would be that it seems to suggest that each living thing, conscious thing, thing interacting actively with its environment, is in a direct relationship to the full truth of existence. Whereas in a typical Christian or Jewish view, as well as most liberal ones, there is never such an immediate relationship, but it is mediated by the word (law), which is interpreted in a community, i.e. its meaning is never fully graspable to a single individual, or at a single point in time. Something which can stifle and frustrate but also protect. I haven't looked at Spinoza's political text yet, interested in what his angle might be on this.
I have also adopted a Spinoza-inspired view on scientific naturalism, where we can view descriptions of reality offered in physics, biology, sociology and so on, as modalities of phenomena, with no need to determine which one comes "first" or which one is more fundamental (which at any rate makes little sense). Same for brain states vs. mental events, and similar.
My aversion to sytamization is methodological. I find piecemeal, bottom up investigation (or at least a sort of pincer attack) to produce more empirically sensitive results. The less commitment to a priori reasoning the better. Should overarching systems emerge fromthis work, then good, so long as they can be revised moving forward. This comes from my pragmatist and naturalist tendencies.
My approach is basically Deleuzo-Guattarian - while interacting with some body of thought allowing pieces to break off at random which can then be repurposed or mutate into something unexpected. This is partly me adapting to my impatience and laziness. But it also seems to fit the way my mind processes things.
Thank you for these thoughtful comments.
Thanks for the encouragement.