Chancellor isn't weak. Insta-shuffle is a thumbs up in my book. It's just that it's weak
relative to other $3 terminals. If my $4 is non-terminal and there's nothing better at $3, I'm opening Chancellor. I'd wager Magpie/Chancellor is a stronger opening than Magpie/Silver. Chancellor will probably also go well with Page. I'd say Chancellor is better than Woodcutter, and usually better than Fortune Teller. I think the reason why it's thought of so poorly is that most new players are just so confused by it.
I would almost never take Scout over Silver.
I hate Rebuild. It degenerates games and is poorly designed. I never understood how it could actually make its way into the game as an official card. It just doesn't lives up to the design standards i expect from Dominion.
I don't mind weak cards. Obviously you can accuse those of bad design, too, but they are not as bad for the playing experience. A Rebuild board will be about Rebuild 90% of the time. A Thief board will be about whatever the other 9 cards are 90% of the time. When weak cards work, it's nice, and if they don't, you still can have a good game of Dominion with the remaining kingdom. In fact, i count many "weak" cards as my favourites, including Chancellor, Counting House and Philosopher's Stone.
I think this stems from the behavior of some playtesters, remembering that DXV mentioned the playtesters disliked Durations.
Rebuild got very little playtesting. Sure, it's strong, and it often dominates boards at the expense of other cards, but there are ways around it.
Cards I hate:
Haven - fuck this shitty little piece of shit stupid shitty...
Champion - remove all thought and challenge from the game once this is in play. I don't hate this
as much because it is a bit of a chore to get. The problem is that TH and Hero are not really cards that you'd really buy on their own outside of a Feodum game. Warrior is really the only Page line card that does anything for me.