Yeah... not good. I don't dislike 'Jaws 3-D' as much as most evidently do, though.
Dennis Quaid and Bess Armstrong are actually pleasant in terms of the cast, none of those behind them are anything worth noting but are somewhat serviceable. I will say I didn't enjoy the plot, but only because it lacked something worth watching - it's poor, not terrible. More of the shark was wanted, but I would personally say that about the preceding two films as well.
Parts of this 1983 flick that are terrible, though, are the special effects, especially right at the end. There is also some poorly done green screen and it, clearly, has a dire cover. There's no doubting this being made was a cash grab, that's basically the only reason to ever go 3-D, but a cash grab doesn't necessarily mean it's an awful film; which this isn't, in my opinion. It's simply bad. The cover is hilariously awful though, granted.