Well heres my experience with a draft... I just got a new percheron TB cross a few weeks ago. She is 5 and had alot of riding done, however, it was all done at her 3 acre home for the last 2 years. When I got her home she was a blowing snorting dragon over everything for days! And let me tell you when a 17.1 big black horse with a head bigger than my torso wants to look big and scary, it is a 100% mission accomplished
Under saddle she is great tho. I went back to basics with desensitizing trying to get her over all her boogie monsters. Though she is a dream to ride, I wouldnt put a green rider on her. She can still have her moments of baby and it could be too much for an unexperienced rider.
As for her being a draft there are so many things I didnt think through very well. I knew she was big but I didnt realize EVERYTHING would be bigger. And Im talking just about everything, from the trailer it takes to haul her, to the amount of food she eats(yes people say they don't eat more than a regular horse and for my girl that's a lie!), to the tack she wears, the poop piles I pick up, to the tempertantrums she has, to the irrational fear she has over stupid things.. I blame the TB half for that. That aside, she is the sweetest mare I have ever known! Never gets pissy or turns into the bossy b**** like our other mare in the barn.
All in all I am happy to have her and glad I got her, just glad I am a somewhat experienced horse person, because she would not be a good horse for a new or fearful person. Her owner was actually intimidated by her which was the reason she sold her. Drafts can be great, just be sure you know what your getting into.