Is Lucas better, did your expectations change, or has the rest of the team who before Lucas left the work to Mascherano/Alonso, now make up for Lucas and help make him look good.
It's surprising how the same player can be viewed entirely differently by an entire fanbase of players over a couple years when they've played the same way the whole time.
It's actually a very good point and I go back to my comparison of Lucas v Fletcher that I made a month or so back...
Fletcher as a young player was built up as an attacking midfielder/replacement for Beckham/next Gerrard.... that soon was obviously not the case and he became cannon fodder for the boo boys (around the time of Roy Keane's infamous MUTV rant).... as the years went by though it became clear what Fletcher was very good at - being a work horse.... then everyone started appreciating him for what he does a lot more. That didn't suddenly make him outstanding though it just meant that the majority started understanding his role in the team, what he brought and how he helped those more talented around him and it wasn't until when he wasn't around you noticed it even more
I've got very little doubt Lucas has improved over the years though as IIRC he was bought around the same age Anderson was when we signed him so 18/19 but then any sort progression is kinda expected (it is arguable that we haven't seen that progression ourselves with Anderson but that's another matter)