Ive always burnt with Nero from ver 4.9.2 to 5.5.x.x to 6.0.x.x and never had one single problem burning DVD's that dont play. All play in my DVD player and I've checked them out on a dozen or so mates different players.
When most people use Nero to burn a DVD they tend to choose Video-DVD as the selection (makes sence really), however, that option is less compatible than burning in UDF/ISO, udf 1.02, no Multisession, no Juliet. Simply select the right settings and it works everytime.