Drifblim doesn't look hideous, although I admit Drifloon looks cuter. I brought her with me to Amity Park... until she evolved at level 28 and couldn't bring her in anymore. I got very disappointed.
Drifloon is immune to Fighting, Ground, and Normal, but weak to Dark, Ghost, Rock, Ice, an Electricity, which are very common types. I definitely wouldn't use Drifloon as an HM slave because she is so cool! Besides, Bibarel and Tropius fit all my HM needs. My Drifblim is a Baton Passer with Substitute and Stockpile. I like how her HP is gigantic, but even that doesn't help her overall frailty too much