I disagree with the worst thing about jets being docking, with twins at least, and the "Thrust Direction Enhancers" TDE setting on my 2013 242 (AND Fins), this thing is super easy to dock. WAY easier than my previous boat - 19ft Stingray with 4.3 Alpha 1 drive. It really makes me look like a pro!
I think the worst thing about jets is the noise. I'm highly sensitive to noise, and I didn't fully appreciate the noise being made by these boats (for one thing it is 2 engines that almost never perfectly sync). However I don't think it is too out of line with other boats, just higher pitched. A close second negative with jets is how many times I have to clean out debris on the river. It has become second nature and no big deal, but it was a concern our first few times out. I'm sure I was shredding my prop with stuff just as often, but that almost never required any clean out, unlike the jet. I'm going to try some of the other methods for cleaning out, but usually it is a small twig or something that wedges itself in the impeller. I've even had one of those heavy plastic crazy straws plug up the impeller once!
As for other attributes, I love the jet acceleration, I love the jet winterization process!, and I love how easy the motors are to work on. I also love the space they give you. My wife loves that there is no trimming to worry about. So I am VERY happy with the jets in this size boat.
I've never owned a boat with an outboard bigger than 40HP so I can't comment on noise/acceleration/etc of bigger outboards, but I would assume they operate in a similar manner to I/O and have similar downsides with winterization and serviceability.