Took a 7 day cruise on the Carnival Breeze out of Galveston in July 2018. Overall it was a mixed experience. Nothing that was bad was bad enough that I wouldn't sail Carnival again (I would), but nothing stood out that would make me want to seek out a Carnival cruise. Overall I had fun, but there were some negatives that went along with the positives.
THE GOOD:
1) Airport transportation from HOBBY airport. I am usually not one to book transportation through the cruise line, but this was well worth it. Check in staff at the airport was top notch, buses were clean, and upon arrival staff shepherd you through the otherwise chaotic atmosphere at the pier.