I dislike some things about Sanjay and his music, but I like some things too. Overall though, I can't call myself his fan - and I don't think anyone would think I am. (That I might be in the process of converting having heard his MMU concert this year is a different story...)
Starting with the dislikes, one of his fans has mentioned it in brief:
natts1959 wrote:a restricted voice and a very sharp personality which could cut the other person into half with choice of words and expression.
Also, his frequent "tup-tup", "dagu-dagu", and shruthi lapses. Often my issue was less to do with the voice limitation itself but more to do with the way in which he managed it (or did not) - I was of the view that the 'asura sadhakam' was better suited off-stage, and the sweet fruits from the practise should be showcased on-stage. I sometimes felt his pronunciation in other languages could be better too, though that is definitely me nitpicking as it is still fine generally.
The only time I heard him this season was during the Vijay TV telecast but I was very impressed. To me it reiterated an interesting change as I could see how he has matured as an artist particularly in more recent years - be it the use of his voice, or the evolution of his views on (and the steps he took in relation to making available) concert recordings. I also found there was less of what seemed to be very annoying nasality which I found in the past (though nobody could beat Unnikrishnan in that department back in the day anyway

).
In earlier years, I felt the style of his answers to the questions demonstrated a certain arrogance because he was trying to show off the intellect in him. I have a few years ago had a discussion about this with someone else who is more directly closer to him and his family (though I am sure I discussed this with arasi too). This year, I actually felt he was being more encouraging and his responses were better. What made it very nice was that the intellect was not compromised; it was still evident in the answers - but without what seemed to be an arrogance component. That could either be his maturity, or very good editing by Maximum Media. I am pretty sure no amount of editing can help (as was evident from the answers in previous years) so must have been the former.
Sanjay's greatest strength imo is his measured innovations and special presentations, and based on the listings posted here, I think he is ensuring (or should ensure) these find an even more regular place in his concert than previously. It really is impressive and well-appreciated by rasikas, even his non-fans, that he is bringing out these compositions which either lay forgotten, or which are just being shoved aside in favour of what can become a very boring standard set if heard too many times in a row. Each of the RTPs he performed in the ragas pattammaa mentioned, are a real treat which I have always enjoyed. (On a side note, I had the good fortune of listening to a recording of his Ragam Tanam in Chalagabhairavi once but unfortunately I missed out on listening to the Pallavi.

It is somewhere out there in someone's archive, so hopefully it will make its way out at some point if he does not disapprove.)
I really wish I could have heard this concert, especially the RTP onwards.