This game has over-the-top anime-styled characters who look like a Japanese slant on American stereotypes with, well, bizarre weirdness abounding everywhere. One of the playable characters is a dog. Yup. That should give you an idea.
JoJo's Bizarre Adventure HD is a port of the original arcade game to the PS3. Evidently, the "HD" part comes from filtering which is used to smooth the pixelated graphics out a bit and, for that matter, is an option that can be turned off. If you want to view the original sprites in all of their... um... glory, you can turn off the HD filtering. If you play with the HD Visuals option turned on, the filtering smooths the jaggies and also adds some pencil-sketch fills, giving JoJo a look that looks more like its original Manga form. In addition to choosing Original or the new HD Visual Style, you can also tweak a few things, such as selecting from 4:3 or 16:9 aspect ratios, adjusting the placement of the H.U.D. elements and choosing whether characters should appear in front of or behind the UI elements. None of this is Earth-shattering stuff, but it's nice to be able to tweak these things a bit, since you're display hardware is unlikely to be the same as that of the original arcade cabinets.
I should say that, in its time, JoJo's Bizarre Adventure was cutting edge stuff, with powerful hardware. I should also point out that, at one point in time, horses were the fastest mode of transportation. A lot has changed in the years since JoJo's arcade debut and, while the graphics are done in a comic book style with its own certain appeal, JoJo's Bizarre Adventure HD simply looks very dated and unless there's a nostalgia factor for you, it's going to be hard on the eyes.
It's also quite hard on the ears. The music is old 8-bit style, which I like, personally, but the vocals are quiet, muddy, garbled clips that were more annoying than listening to an audio book of Shakespeare as read by a Speak & Spell. It's actually worse when you figure out what they just said and you're trying to convince your friend of what you just heard.