Reeves is a shitty director. The guy writing Cloverfield also sucks.
Not really. They're both unknowns, really. They're from the Abrams and/or Whedon camp of television production, so they're not awful and they ought to understand genres working underneath those two. But neither have much in the way of a resume when it comes to film, so you can't really say if they're bad or good. Cloverfield will speak for itself.
Drew Goddard was one of the best writers of the later seasons of Buffy. That ain't saying much, and since he has a lot of writing credits on Lost and the non-good years of Alias, it is a safe assumption that he is at best mediocre.
Matt Reeves, well:
Cloverfield (2008) (completed)
... aka 1-18-08 (USA: promotional title)
"Conviction" (1 episode, 2006)
- Pilot (2006) TV episode
"Miracles" (1 episode, 2003)
- Pilot (2003) TV episode
"Felicity" (5 episodes, 1998-2001)
- The Declaration (2001) TV episode
- The Slump (2000) TV episode
- Felicity Was Here (1999) TV episode
- The Last Stand (1998) TV episode
- Pilot (1998) TV episode
"Gideon's Crossing" (1 episode, 2000)
- The Gift (2000) TV episode
"Homicide: Life on the Street" (1 episode, 1997)
... aka Homicide (USA: informal short title)
- All Is Bright (1997) TV episode
"Relativity" (1 episode, 1997)
- Billable Hours (1997) TV episode
The Pallbearer (1996)
Future Shock (1993) (segment "Mr. Petrified Forrest")
He is a TV director that has never done anything that important. And now he has a big movie that absues shaky came. Po-tay-to, Po-tat-o, you say unknown quantity, I say mediocre. B- 6.5/10