Your neighbours may not be so invested in their home as you...
That one I would say, more depends on the area the property is in generally anyway.
If you plan to re-sell, it may be trickier to do so, and less likely to achieve comparable private home market value
Hasn't appeared to be the case on our estate. They have held value and saleability comparable with fully owned property.
I WOULD say, to be mindful of the area generally. Is it all shared ownership or a mix. Is it a sought after area, with good schools etc, then shared ownership is more likely to fair a lot better. If its an area where there isn't much building or likely to be much building, again its not a bad bet. Basically, is it usually a high demand area - if it is, I don't think it is so much of a concern as those issues will help offset any concerns potential buyers might have.
The other thing I forgot to mention, was to look at the staircasing options and whether you can buy the entire property or not. Some schemes only allow you buy a certain percentage. Ours was 100%. I wouldn't be so keen to look at ones with restrictions on them.
Building insurance was never much of an issue as it was included as part of our rent.
Our mortgage and rent combined worked out far cheaper than a mortgage would have. We have been caught out by the bust of 2008, but our mortgage now still works out more despite the house now being valued as worth less (it is comparible with other houses). We see it as a long term investment, and hope to recoup that loss in time.