The well meaning world of internet journey planners – as Ernie Hsiung says Google doesn’t always get it right either. The comments Ernies post generated reflect a US perspective (even with SF having better than average PT options), but I can imagine the same comments here.
In the UK (and I will go out on a limb here) we have TfL Journey planner which I find pretty good and reliable, the National Rail Planner which is much improved and which I consult almost daily, Traveline varies by region and Transport Direct – sorry, still not good enough. Google Maps UK only offers you the driving route, so can’t offer a comparison between UK and US versions.
Now I recognise how hard it is to get complex journey combinations right in the fragmented UK public transport system, but getting credible and sustained mode shift needs information about the product. Other consumer goods seeking greater market share wouldn’t be sold in such away that potential customers give up before they even get to the bus stop.