I actually like that I can't hunt on Sunday. It extends my season and helps maintain my marriage to have a day off every weekend. I fully understand why others feel differently.
I don't know what other states do, but in Maine, if you shoot a Barrows "by accident", there is no penalty so long as you self-report and turn the bird in. Unfortunately, despite the fact that this is well advertised in our waterfowl regs, some hunters just dump the carcasses instead. I found one last year. That will get you a ticket--and rightly so. FWIW, I;m not sure it makes sense that Maine protects the Barrows. It would make sense to me if they were protected up and down the east coast, but I believe they are legal game in all of the Canadian provinces and the rest of New England. On the other hand, they are rare and perhaps declining, and due to their rarity and concentration in a handful of well-known Maine locations, they were being targeted by trophy hunters. Although this was legal, it gave hunters a black eye with birders who were also trophy "hunting" the same areas. IMHO, it would have made more sense to close the known areas of concentration to diver hunting rather than a statewide ESA listing. Another option would have been what at least one of the Canadian provinces does, which is to have a bag limit (3?) on whistlers, but to not allow you to shoot any more once you have a Barrows in the bag.
But the rules are easy enough to live with. Of course, my sense of this is strongly influenced by my experience with Maine's warden service, who in my experience have been both highly knowledgeable about ducks and duck hunting, and fair in their dealings with me and with other hunters. In particular, they have been outstanding in dealing with conflicts with non-hunters who complained about legal hunting.
I'm sure I'd feel differently if they were not so professional.