I don't think any dogs are really that easy - maybe they're easy to experienced dog people - like I always say Quinn is easy compared to Dally, but for anyone new to dogs a dog is going to be a huge step up from a hamster or even a cat. Like others have mentioned, a new owner who is willing to put in the time, training, and research can have a lot of options (even some of the "harder" breeds), but someone who isn't willing to do anything generally won't have such an easy go at it.
Australian Cattle Dogs, definitely not for the faint of heart. Definitely not even for me! Granted, Dally is the highest energy most drivey ACD I've ever met but I just find her exhausting. I'd probably do OK with a dog like her litter brother, who is a little less demanding, but I'd still rather an English Shepherd or a GSD now.
English Shepherds are way easier. They'd probably still be a lot of dog for a first time dog owner (unless they did a lot of research and had the right schedule/lifestyle, in which case it would probably be a-okay), but for someone with a little bit of experience with herding breeds they'd probably find them pretty easy. I've grown up with herding breeds (Aussies, ACDs, GSDs, lots of experience with BCs) so Quinn is nothing new to me, but I'm sure she'd be a bit of a step up had I only had experience with common apartment and city dogs. Quinn's breeder has put quite a few pups with suburban families and they're just fine, but she's also very careful screening homes and matching up the right pup with the right family.
All that said I've seen situations that you'd never think would work, work out perfectly. A friend of mine lives in the suburbs and has a super nice female BC. I have never seen them do more with this dog than let her romp around the yard by herself and snuggle with her inside, but the dog seems totally fine with that. Granted the BC is now in her early double digits so she isn't a young girl anymore, but even when my Aussie was that old she required more stimulation. It's so dependant on the dog and person/family, although obviously you want to set yourself and the dog up for success, rather than counting on exceptions like this.