I've never had any interest in the modrons whatsoever. Monte Cook and Co. had to do some really Herculanean effort in The Great Modron March and the whole Tenebrous story overall to make them even vaguely palatable.
Even then, I really wish they'd used something else. Any detail on modrons is wasted space and effort to me.
I dislike them for a couple reasons. (1) I generally dislike all extra-planar creatures except some of the more common evil outsiders that come to the Material occassionally and (2) they just don't look like expressions of primal Law to me. I'd expect them to look more like a bunch of featureless polyhedrons and globes.
I never liked the idea of creatures based on platonic solids, it was too reminiscent of 'silly' D&D that I used to occasionally play for a laugh in the late '70s, alongside the carnivorous parking meters and such like!
I'll be the supporting voice then. I love them. I did play through Modron March/Dead Gods, so that helped. I'm playing an exile right now. However, I think they only work in Planescape. In a normal D&D setting, they are unneeded. (To that affect, I think the same thing about Githzerai, Bariaurs, Yugoloths and Sigil. Only useful to Planescape, unneeded elsewhere).