Lallana is decent, and you can usually sign him for less than the 20-25 mil Liverpool are likely to pay for him in the real world.
But he is by no means world beating, and for 5-10m more than his average price tag in game, you could get a higher quality AM....
William Carvalho, using the standard FM database, is not quite as good as the hype he gets in the real world. He might have better stats in popular updated DBs, like LFCMarshalls.
I haven't seen many images of him fully developed, but given his CA/PA (which I won't repeat here), I can't see him developing in to a high quality DM.
He's like a poor man's Wanyama, but without the Marking and Tackling.