I've made a fair amount of complaints about the Minutemen myself, but I'm on my second play through now and I'm not finding them to be as annoying as I once did. As far as their personalities are concerned, Marcy and Jun Long leave a bit to be desired. Preston is annoying mostly because of the overly repetitive nature of the Minutemen quests. Personally I don't have a problem with always having some Minutemen quests on hand. What I have a problem with is being sent to the same 2-3 locations over and over again. The way I see it though, this is mostly a bug of some sort. If the Minutemen quests took me to consistently different locations, I'd have no issue at all with them. It may also help if it was at least somewhat optional. The radiant quests for the Brotherhood can go on infinitely, but when you finish one, they ask you if you're ready for another one. This makes a big difference.
As far as the power armor was concerned, I have no issues with that whole scenario. It was basically a tutorial on how to use the power armor, which is somewhat different than in previous games. I thought it made for a cool introduction to the game personally.
Hangman's Alley is an awesome settlement location. You just have to be creative with it. I spent about 4 hours doing a build there last night, and it's great. I did a really vertical build that goes almost to the tops of the roofs of the surrounding buildings. It's a really unique settlement because of how difficult it is to work with. Search for some videos on builds at Hangman's Alley and you'll see just how cool it can be. I'm on a relatively new playthrough and Hangman's Alley is going to be one of my main settlements this time through. I didn't use it much the last time. If you don't like a given settlement, you don't absolutely HAVE to build anything in that location. If you're required to build a radio beacon to complete the quest, build it and then either scrap it, store it, or just shut it off. If any settlers happen to still show up just send them to a different settlement. There are, I believe, 30 settlement locations in the game. In order to complete the game with the Minutemen you're required to set up 8 of them. If you aren't fond of the smaller settlements in weird locations, then there are plenty of big and wide open ones that you can focus on. The fact that they gave us some variety in settlement locations is a GOOD thing. Having big wide open settlements like Sanctuary, Starlight Drive-In, the Abernathy Farm and others is great. But the settlement system would get incredibly boring if they were all like this. I like building on some of the really obscure settlements like Hangman's Alley, the Coastal Cottage, Murkwater Construction Site, Jamaica Plains, and others. This keeps the game fresh. Rather than just picking an empty flat plot of land, you're forced to get creative to make it work. Settlements like Hangman's Alley are great especially for people who don't like to fast travel. It's a central location right next to Diamond City and within a very short distance of quite a few key points. Regarding the food and water there, if you haven't been able to plant a sufficient amount of food and water at Hangman's Alley, then you haven't tried hard enough. There's a huge open patch of dirt outside of one of the gates. I have 30 mutfruit there and a total of 24 water worth of the level 1 water pumps. And there's plenty of room to spare there.