I agree to a certain extent. Sometimes there are just too many hoops to jump through. It's a buyers market at the moment and these FTB schemes are designed purely with people with who have next to no deposit in mind. The only people really benefiting are the builders, think about it, why would they give people a 15% interest free loan??? It smacks of desperation imo. You would still have 95% secured against the property, and at current market trends, could easily become negative equity within 3 or 4 months. Then you try and sell it and realise that the builder sold it to you above what other comparible properties are selling for and you'll find yourself marooned, so that 95% has now become 110% and it's going to cost you to get rid of it.
The best bet is to try to save a regular deposit, this will give you the entire market to choose from and put you in a much stronger position when you do actually cometo buy.