If memory serves, and it hasn't for years, neither Disk Utility nor a Finder
Burn will yield a usable DVD from an MTR rip. DVDs are in a special format,
UDF I think, that OSX eschews.
Toast or Popcorn will do the trick (both Roxio commercial products). Toast
is pricier. Popcorn is designed especially for DVD movies, and even does the
compression for you so you don't have to use MTR's rather iffy "Main Feature"
option.