I suppose that, unless someone did something really bad towards me - and that would have to be something like sustained, severe physical abuse - I neither greatly like nor greatly dislike anyone. I suspect this rather non-plussed, 'neutral' standpoint doesn't bode well in making friends . Unlike many NTs, however, I don't hold grudges, I don't get jealous or envious of anyone - if there have been past disagreements or a certain coldness still exists between people (which might be me and someone else), I operate from a clean sheet and as if no disagreement had happened at all: unlike NTs, who tend to take it to heart, let it adversely affect all future social interaction, refuse to speak to others for the most petty of reasons and, above all, get themselves emotionally upset and bothered by it. You are doing only yourself harm - no-one else is - why bother with it?
Therefore I'd not really have any opinion on liking or disliking Tony Attwood. In any case, I've never met him and I've been neither in favour nor against anything I've read that's he's written. That said, I've not been diagnosed that long and haven't 'studied' autism for that long. And any critique from me would, I guess, be in the measured and cautious academic approach I tend to operate by (I'm not a professor or lecturer by the way).
For a critique of Tony Attwood - he does seem rather big on "theory of mind" stuff. This can be seen not only in Chapter 5 of "The Complete Guide..." (my first thought on seeing the title was 'how can a single volume book ever be a complete guide to anything? But, when I read the book - from cover to cover in one sitting of course - I found it is fairly comprehensive), not only Chapter 5 of the book, but also for example on page 100, where, under the heading "THE SIGNS OF BEING BULLIED", he claims that "Children with Asperger's syndrome are less likely than their peers to report being a target for bullying or teasing as they have impaired Theory of Mind abilities;..." and goes on to cite his own work and that of Baron-Cohen of 1995.
Although two points (and probably more) themselves arise out of this - I was often bullied at school for instance and did often report it - itself a problem as going to teacher and 'grassing' wasn't the done thing of NT peers - my different behaviour set me up (unknown to me at the time) as a target for that - and itself indicated my lack of awareness of social convention so often a symptom of AS - and, second point, as Tony Attwood himself says elsewhere in the book, if two people both enjoy the experience then it isn't bullying - but if, as a child with AS, you don't recognise that you are a target for bullying (due to having impaired Theory of Mind) then how can you be bullied if you don't recognise yourself as being bullied - you may, because you do realise you are being bullied, thereby enjoy the experience (as you haven't seen it as bullying) and therefore it isn't bullying? Or maybe I am missing something here or not recognising it myself and 'being autistic'.
Anyway. Tony Attwood seems big on theory of mind. But perhaps it is not mind-blindness (lack of theory of mind) but context-blindness instead: see http://autismdigest.com/context-blindness/ (which, in this context , or not ) may act as a critique. It is an article by Peter Vermeulen from 2011 entitled "Autism: From Mind Blindness to Context Blindness". Or perhaps I've totally missed the context of that article and it isn't at all.