The way he carried himself in the media room could be strange to those who weren't around him all the time, he was loud, boisterous, gruff, etc. If you weren't around him much, it could rub you the wrong way. It did me at first in the wide-open spaces of the Indy media room back when I first started covering the Brickyard 400, when he was going off on some topic de jour within earshot of where I was trying to work.
But it was clear if you covered any NASCAR -- even if it was just a race a year like I do -- that he was loved by everyone. For the best of reasons.
Like others have mentioned, his work was definitive. Along with Ed Hinton, he was the dominant figure at every NASCAR presser I've covered, including the tire problems at Indianapolis last summer, when hard questions of NASCAR were warranted.
Keep in mind that NASCAR's media is chock full of brown-nosers, etc., who are keen to ask softball questions. Poole always stood out against them and I admired his zero tolerance for NASCAR's seemingly endless capacity for bullshirt.
As 21 mentioned, his SJ contributions here were also must-reads.
He was also very funny. Last year, before a presser, he launched into his Chris Economaki impression, since the media was assembled in the Chris Economaki Media Room at Indy. It was off-color, disrespectful in a loving way, and extremely hilarious. IJAG was there too and she had one of his Economaki lines in her sig for a while.
I wish I would have got to know him better. The more I was around him, the more I liked him. As I got older, I came to realize that someone being himself in the media room wasn't really anything to get worked up about ... just sit back and enjoy the show.