First off, let me just say that about 2 months ago I bought Fallout 3 and was in the exact same position as you. Now I have over 50 hours of playtime on Fallout 3 and I'm still not bored.
I implore you to give this game a chance before you say that it's boring because believe me, it's not. The beginning part when you are in Megaton is a little boring but here's my suggestion:
finish the Wasteland Survival Guide quests that you get from Moira Brown. The early quests are pretty boring, but it's still the beginning of the game. What would you expect? After you're done with them and a high enough level, kill everyone in megaton, steal their stuff, rob their homes, and blow it up (you get the quest to do so from Mister Burke in Moriarty's Saloon). After that the game starts to get fun. Blowing up Megaton will immediately bring you to the lowest karma, but having low karma makes you evil which is more fun in this game as it leads to more benefits for you. When you start doing missions in Tenpenny Tower and Rivet City the game will start to pick up.
Another important aspect is skills. I suggest for your first playthrough, work on the important skills which are medicine, repair, lockpick, small guns, and sneak. Everytime you level up you can increase your skills and choose 1 perk (I suggest getting perks that help you with these skills).
Don't focus on the main plot too much, as most of the fun in the game is in the side quests. There are numerous towns and locations across the Wasteland that each have interesting background and situations.
I'm not gonna address everything you said in your post simply because if you give this game a chance like I did and push through the somewhat boring stuff in the beginning, all your questions will be answered and you will realize how much of a masterpiece this game is.
If you need any more help check out the fallout wiki website. It's a great guide for new players and answers a lot of questions you may have.
Please believe me when I say that you are judging this game way too early, and that you should continue playing. It really isn't fair to decide whether this game is good or not when you probably haven't even seen 1% of it.
