Absolutely, the primary failing of the 6e conversion of weapons is the AR/DR system...
Why all this text about AR/DR? Yes, a smartgun system in SR6 also increase AR by 2 (which is very similar to how a smartgun system in SR5 increased Accuracy by 2), but this is hardly the main reason why you get a smartgun system.....?
In SR5 [wireless] smartgun system increased dice pool
In SR6 [wireless] smartgun system increase dice pool
Accuracy has a meaningfully interface with the roll in question where AR/DR does not. In short Accuracy does something, keeping more success is meaningful to the roll and as such is worth the investment, the a +2 to hit is a decent bonus and in conjunction with it's accuracy bonus, together they make it worth the essence cost and the risk of running around with wireless up. Sadly the nether are true for 6e it's primary function a +2 AR is useless and it's wireless one die isn't a large enough bonus justify the risk or the costs. Sure if you like the 6e smartlink you should feel free to pay that for a single die bonus that leave yourself open to attack. But the cost and risk out ways the a single die bonus as I see it. There will always be more ware, and new ways to get bonuses, better save the resources and wait for something less useless. The cyberware or combat book I'm sure will have new and better options.
Now I certainly will agree the 5e Smartlink isn't as good as the 3e smartlink. But the 5e smartlink is still several times more useful then 6e smartlink. Thus 6e is the worst one yet.
Xenon, you asked me to "elaborate what you specifically think is bad about the smartgun system (game mechanic wise) in 6th edition compared to for example how smartgun systems worked in 5th edition" and I have done so. I hope they errata in a way to make AR/DR useful. AR/DR not be meaningful is major failing of 6e. Making AR/DR effect pools could over come the useless armor flaw, with another small change it also fix the str being meaningless on melee flaw as well. Another point to be considered is could re-open the tank Archetype, something I think 6e was foolish to close the door on. Now I have suggested a solution. (IE Make the net difference on the AR v DR comparison a bonus or a penalty to the related attack pool. Your going to have to do that math anyways, so taking it a step further isn't going to increase complexity.) I don't think they will take it of course, but I have done my part on trying to get it fixed.