I watched this because I'm a fan of the reboot Doctor Who, and I've been curious about this one.
This movie is absolutely terrible and honestly I wouldn't have it any other way. As an action or adventure movie its incredibly boring, with basically nothing happening. What does happen is completely nonsensical and poorly conveyed. It is however made of vibes. The TARDIS interior lacks the verticality that would be seen in the Twelfth Doctor era, instead opting for a spacious Victorian sitting room look with a spaceship console plopped down in the middle. It's dumb and I love it. The console itself has a big rolling display that the Doctor twists by hand to show the date and era (Rassilon Era for "modern" Gallifrey, "Humanian" for Earth). A neat touch the reboot show didn't seem to take is that at the end the whole ceiling becomes a sort of planeterium showing the starsystem. The only other sets of note are the Eye of Harmony room, a big gothic stone courtyard complete with gothic windows open onto some kind of lighting despite it being inside the TARDIS (there are also leaves!) and the dystopian ruined wing of the hospital that The Doctor wanders into.
The plot is weird. Maybe I don't have the old Who context, but something tells me knowing it wouldn't help. The Master is tried by the Daleks (??) and his last will, which the Daleks agree to(?) is for The Doctor to transport his remains—which come in a little jar that gets locked in a chest—to Gallifrey. Something goes wrong and The Seventh Doctor crashes the TARDIS in San Francisco in the distant future of 1999, the day before New Year's Eve. He steps out of the TARDIS and is immediately shot.
The Master then gets away as a slimey goo monster, takes over an EMT's body, kills his wife, and immediately starts dressing in black leather and doing a T-1000 impression. He also cons the most gullible kid in Chinatown to be his Companion. I cannot impress enough how Chang Lee is the dumbest man in the world to believe the ridiculous things The Master says. I don't want to stereotype or anything, but the man literally has snake eyes and is overtly evil. He doesn't even pretend to be nice, and that Chang is convinced that "he stole my body and wants to do evil with it!" is so hilarious.
Grace isn't much better. The idea that a John Doe dying on the operating table because he has a physiological quirk the doctors weren't aware of would not be some scandal that ruins the hospital, even if the body is stolen. Not that it really matters, that entire plot goes nowhere. Grace does, however, have a boyfriend who doesn't appreciate her. But then again, she's also the type of woman to go on a date night to the opera when she's on call, which seems like maybe the problem is her. The ex really only exists to ship the Doctor and Grace with that romance trope of "my boyfriend is a jerk". But he's not even in but one scene. There's more chemistry between Thasmin, and that's a ship fans created out of copium.
This movie is on par with whatever your second or third least favourite NuWho story is, but above Aliens of London/World War III. It certainly is a Choice™ to have the Doctor without his doohickies like the Sonic Screwdriver and stumbling around with amnesia for no reason. The whole plot is also tied to the turn of the millennium (San Francisco time). Physics starts breaking down so that the Doctor can walk through glass. It makes no sense, but that's par for the course. There are moments that I laughed out loud, but I don't think the movie really wanted me to. The scene with Sylvester McCoy regenerating into Paul McGann is set intercut with scenes of Frankenstein playing on a television, with cheesy effects of wincing and moaning as the one actor turns into the other. The Doctor is introduced reading The Time Machine, by HG Wells. At one point he offers a motorcycle cop a jelly baby, then steals his gun and threatens to shoot himself. The Master puts on a random outfit that logically he must have stolen from The Doctor that is over the top and supervillain looking. At one point they pull a fire alarm and as everyone evacuates there's just some guy vacuuming. I knew the movie said that The Doctor was half human, but I thought it was mostly a throwaway line. No, it's like a core plot element, and even The Master seems to know it. Maybe this is a Cartmel Masterplan sort of thing, but it's so silly in hindsight.
The climax of this movie should probably come with a photosensitivity warning. It's mostly just a bunch of flashing lights while the human Companion somehow figures out how to rewire the TARDIS to go back in time to yesterday and that solves everything somehow. Not the most ridiculous climax. Also the TARDIS just straight up eats The Master.
Again, this movie is dumb as hell and if you're familiar with Doctor Who you should already know to expect that. Gonna be honest, whatever Big Finnish has Paul McGann doing is probably better. Night of the Doctor was better. But he's really charming here, and he has better hair than in Night of the Doctor.