I've played dozens decks over the years and I've never had as much fun as with Death and Taxes. The interaction, the flickerwisps on end steps, the Resto Angel bluffs, all of it is just so interactive and fun. And the fact that it's not a "solved" deck and is very much a personal deck really adds a lot for me I think.
I've been playing the deck since about 2009, back when it looked really different and had stuff like Jotun Grunt and Stonecloaker. But it's the same basic strategy and themes, and evolving over the years with the release of cards like Thalia and Resto Angel has been really a ton of fun. Every set, I scour for the new hatebear they print.
I really enjoy burn, naya/bant coco, orzhov control, soul sisters, g/w value coco, and a bunch of other things but my favorite deck that's held that title for many years is easily D&T. No other deck has had that same level of guesswork and rewards for doing my homework on the format and rewards for knowing opponenet's decklists and stuff like that. It hones your game rules related knowledge as well. The deck makes more use of end steps, grafted triggers, special actions, timing tricks with etb effects, and stuff like that.
It's also never bad. There's always a hatebear for whatever is popular. You just have to adapt. So the d&t list you used last month might be bad, there exists a card to make your list good now if you alter it. It's really fun to take a look at the meta and sit with Gatherer and find the appropriate hatebear to bring to the next event, and when your homework pays off it feels really good. Obviously other decks can do this to an extent, stuff like Ceremonious Rejection being good some week or whatnot, but the entire deck is centered around this idea so it feels very rewarding to get it "right".
I recommend it to everyone.