I think 'organised religion' is just the natural result of people with similar ideas getting together. There's nothing inherently wrong with that and it's inevitable that people who think in similar ways are going to find each other and discuss their ideas.
I have no problem with organised religion in principle, heck I could even be said to belong to one if you take a liberal view of what constitutes "organised". What I do tend to try to avoid is rigid, dogmatic orthodox religions. Once a religion loses its flexibility, that's when the problems begin. It moves steadily from "We got together because we all believe things that are quite similar" to "Our organisation believes this, if you want to join, you must believe this" to "We believe this and it is The Unassailable Truth, so you must join us and believe it too or you will suffer for your transgression against Truth." This is pretty much what happens when your organisation starts encouraging ideas of it's truth being The Truth(tm).
This does not, by any means, always happen in organised religion. Look at the UUs. Admittedly (and sadly), my experience with them has been limited, but to me it seems that they never lost their fluidity and seemed to have thus far managed to avoid the pitfalls of orthodoxy and rigid dogma.
So, I think organised religion is fine, but I usually have no time for strict dogma.