Yes, there are plenty of good QH jumpers out there. Growing up we always jumped ours (even the shorty cutting bred horses can jump) I jumped my reining mare as well as an running bred QH mare, both were fun. Reiner - she was only 14.3 but would go for the moon, wasn't as pretty as some but when it came down to a timed jump off, she was stellar because she could take some really tight turns with ease and in a hurry! I never pushed her past 3'6". My running bred mare (15.3) was more graceful and much more the hunter type, she was really scopey and a fun ride, I took her to 4 ft.
Here's a QH jumper