The information provided was good - as far as it went. I did find the author tended to concentrate on his own styles of drawing which are very much pencil or ink sketching styles. This probably contributed to my lower rating - personally, I prefer to draw in colour pencil or paint in watercolours and while they are mentioned in the book, it seems little attention is paid to them.
I thought the 'Fantasy Animals' section was reasonable in respect of the techniques demonstrated, however the examples used (an armoured rhino and a creature adapted from a tortoise) were perhaps not the best examples to use as an introduction to fantasy art - more 'traditional' fantasy creatures would have caught my imagination better, e.g. a dragon and a unicorn or a pegasus.
The 'Castles and Citadels' section was probably the best in the book, I think because it was more a step-by-step guide to drawing them. The rest of the books lacked step-by-step techniques that I could follow easily as a non-artist.
On the whole I would recommend it if you're interested in drawing in ink, or graphite, but not so much if you're more a colour pencil or paint artist-wannabee. Maybe more useful as a secondary reference in this case than a definitive guide on how to draw fantasy.