It's rare that I disagree with a post from you as strongly as I do with this one, for a variety of reasons:
1. IMO goals are not the only, arguably not even the main, measure of quality in any player except a striker.
2. Lallana is opening up defences - it's no accident that he's high up on Morse's MOTM list, despite his scoring record, and not for the first time either.
3. Your post makes Yossi and Garcia sound like failures, and they just weren't.
4. Thanks for setting Modo off again. Not.
1. Attacking midfielders in the EPL have always been expected to score goals. I could understand the argument for a classical trequartista like Iniesta or Riquelme not needing to score goals because they influence the game so strongly otherwise, but Lallana isn't that sort of player at all. He doesn't provide controlling playmaking at all. He's a floaty AM, and that sort of player really needs to provide goals to be of any value. Silva, Eriksen, Ramsey, De Bruyne, Mata, and Coutinho all provide a much better goal threat than him. Even mid-table AMs like Mahrez, Payet, Ayew, Wijnaldum, Tadic have outperformed him this season.
2. That's really your subjective opinion. Lallana can and does look good from time to time, but he is highly inconsistent in this. The biggest issue for me is that he just doesn't step up when the likes of Coutinho and Sturridge are out. Morse's MOTM table is hardly clinching evidence for the value of a player (there are many flaws in that sytem). In any event, Lallana is only sitting 5th on that table - and that's when it hasn't been updated since the Bournemouth game. He's probably sitting in 7th or 8th place at the moment since Coutinho, Lucas and Clyne have had some excellent games since then. That's really not a great position.
3. That's just the way you've read the post. Both Garcia and Yossi were productive players (Garcia scored 30 in 3 seasons, Yossi scored 29 in 3 seasons), but I think we'd all agree that they had their limitations, consistency and quality wise. The only reason I mentioned them was that they probably best represent the Liverpool benchmark for AMs in recent times. Ideally, you'd want that bettered (as Coutinho is doing), but Lallana isn't even matching it at present.
4. That's really none of my concern. Ignore him if it helps.