Hi think it would depend who you were asking....another Christian, an agnostic, a Hindu or a Jew etc etc
I can only answer from a Christian or agnostic perspective, I think. The shunning is pretty shocking. It doesn't come off as Christian behaviour. The non charitable stuff was quite a stumbling block, too. Surely that's the main tenet of Christianity? The concept of preaching being such charitable love of neighbour you can only do that is a very weak argument.
It began because the colporteurs were basically book salesmen - it was essentially a job. Can you leave your job to go work in a soup kitchen? Usually not, hence the tradition of no charity in Watchtower. For people attracted by Christianity it's a H-U-G-E red flag.