I think neat and tidy is a perfect description. Defensively Gerrard, Mash and this year Alonso all have a bit of mongrel in them and Lucas definitely lacks that. He chases as hard as anyone but Gerrard, Mash and Alonso seem to hunt the ball and fight for it once it's in dispute. Lucas lacks that hard edge. In the past (prior to this year) I thought Alonso used to be a bit like Lucas in this regard but at least Alonso always had his killer passing to fall back on.
Offensively Lucas is a little vanilla. His movement is good, he creates space for his midfield partner and genrally hit up his targets but isn't damaging with the ball. That's fine when playing along side Alonso or Gerrard because his movement creates space for his midfield partner to be damaging. But when he is partnered along side Plessis, he gets found out.
He's a solid player and I think people are being a bit harsh on the lad but I think he looks like he will be a good DM for a club like West Ham or Blackburn. But he doesn't belong at a club like Liverpool. He doesn't have that special talent, neither defensively like Mash nor offensively like Alonso, to be at a top premiership club.