The first part of JoJo's is a little different from the rest; when most people rave about it they're talking about Part 3 and/or Part 4 or later, though there's a solid number of people who prefer Part 2. Part 1 isn't necessarily bad, but it's arguably the least JoJo-y JoJos, presumably because it took the author a while to figure out what the series should be about.
If I had to summarize what I value JoJo for, it'd probably be "ridiculous bullshit." It's very good at being ridiculous and bizarre in a sort of semi-grounded way, which lets it pull off having relatively serious, reasonable characters subjected to utterly unreasonable situations without the whole thing ceasing to matter because lolcomedy. There's the usual raft of "the characters are likeable" and "it has cool powers" and so on besides, but that's probably one of the more uniquely and quintessentially JoJo qualities about it.
Unfortunately, Part 1 has relatively little of that. Not zero, mind, but it doesn't get really, really JoJo-y in that sense until Part 2, where things get real silly real quick (but again, not so much that the world or its situations feel flimsy). I hate to say "watch Part 1 which sucks so you can watch Parts 2+ which are awesome," but that's more or less what I'd recommend if you're finding Part 1 okay but not amazing. If you find it really can't hold your interest, I'd advise just hopping to Part 2 and coming back for it later if the later parts catch your interest.