Re: Directors whose latest film you'll always see...
Granted, some of the filmmakers on my list have made one or more films I probably wouldn't have seen had they not directed it (Spielberg's "Amistad" and "Lincoln" come to mind, as do Scorsese's "The Age of Innocence," "Kundun," "Gangs of New York," and "The Aviator;" Aronofsky's "The Wrestler" and "Noah;" etc.). I'll also admit I haven't seen Spielberg's "Always" in its entirety (and, considering it's widely considered one of his weakest - and schmaltziest - films, I probably never will
), nor have I seen Peter Jackson's first 3 cheapo features (come to think of it, I don't think I've seen "The Frighteners" in its entirety, either)... or Cronenberg's "Shivers" and "Rabid"... or Polanski's "What?," "Pirates," and "The Ninth Gate" (though the latter two are largely considered his worst films, so, again, I may not ever bother).
A few directors who are on the bubble:
Rian Johnson - He's still only made 3 films, so it's probably too soon to include him. All his films so far have been solid, though I wasn't nearly as impressed with "Looper" as many others were.
Thomas McCarthy - He's also still only made 3 films, and they all had the same basic premise (a stranger comes into the lives of the main character(s), and has a profound effect on everyone involved). We'll see what he does with "The Cobbler."
Jay & Mark Duplass - Another brotherly filmmaking team whose sensibilities seem to lie somewhere between the Coens and the Farrellys.
Again, all their films have been solid so far, though I wouldn't absolutely rave about any of them (though their debut "The Puffy Chair" comes close). Also, Mark now appears to be focusing more on acting than filmmaking, so we'll see what happens with their filmmaking future.
Atom Egoyan - He seems to have become strictly a for-hire thriller man. Save for 2008's "Adoration," he hasn't made a 'personal' film in 13 years. We'll see how "The Captive" fares before I drop him off the list completely.
Michael (& Mark) Polish - See the Duplasses, basically.
Lynne Ramsay - I've really liked all 3 of her films so far, but she hasn't gotten much traction in her career over the last decade, full of false starts and dead ends. It's amazing she got out "We Need to Talk About Kevin."
Brad Anderson - He never reached the heights I thought he would after "The Machinist" and "Transsiberian," and I skipped "The Call" entirely. I liked "Vanishing on 7th Street" more than most, and "Stonehearst Asylum" was a decent effort... but I'm still looking for more 'wow' factor from his work.
Richard Linklater - I'm willing to officially put him on the list if he never does any "School of Rock"/"Bad News Bears" (the latter I never saw) for-hire jobs anymore.
David Gordon Green - He WAS on the list until his 'Judd Apatow' trilogy (I saw "Pineapple Express," but I just couldn't bring myself to see either "Your Highness" or "The Sitter"). I'm willing to consider those an aberration if he continues to get back to his roots (as he's attempted to do with "Prince Avalanche" and "Joe").
Jason Reitman - He was also on my list until recently. "Labor Day" was a surprisingly safe and obvious effort compared to his first 4 films. And while "Men, Women and Children" was a bit of an improvement (and perhaps even better than "Young Adult"), it's still hard to tell whether he's already losing his filmmaking mojo.
Michael Winterbottom - He's probably the second most prolific filmmaker out there right now (after Woody Allen, of course). His films are nearly always interesting, but they can sometimes be unremarkable. His best collaborations with Steve Coogan and Rob Brydon continue to be his best work for the last decade.