Yes, he's better than them, but that's not particularly difficult. He hasn't scored or assisted in the league since Arsenal. Embarrassing.
You don't win titles with players going missing for two or three months every season.
Just to add some context to that, it's over 400 minutes since Firmino scored or assisted in the league, having done both against Arsenal (and Watford in the first game in the season). In that time, Harry Kane has scored 8, Sergio Aguero 6, Gabriel Jesus 5, Romelu Lukaku, Alvaro Morata and Alexandre Lacazette 4.
Aguero broke his ribs and Morata pulled his hamstring during this period. Abdoulaye Doucoure scored 3, fwiw. (Get him up front, his pressing stats would be boss.)
Who knows how many more points those sides have picked up than us during said period as a consequence.
Meanwhile, Firmino remains on one goal from open play this league campaign.
To add some balance, after that match against Arsenal, the BBC posted this stat:
Roberto Firmino has scored and assisted in a game on eight occasions since his Premier League debut in August 2015; no player has done so more often than him in this period (Costa & Lukaku also on eight).
That's quite an impressive stat (although Lukaku has since overtaken him again). It clearly shows he's a good player.
However four of those eight matches were against Arsenal and the 2015/16 Man City side, two sides playing out from the back with a high line, both of which Firmino tends to exploit.
It also highlights his inconsistency. When he's on it, he's seriously on it. But when he's not it isn't far off playing with ten men. I don't buy that his movement or his pressing is as invaluable as many portray in most matches.
In his last six games, WhoScored have rated his performances as 5.82, 6.62, 6.40, 6.14, 7.49 and 6.68. I think they're actually quite accurate ratings when you consider the 7.49 was against United, in a match he had four shots, completed five key passes and four dribbles. We didn't get the goal or the win but he heavily contributed to a decent performance. In the rest of these matches he has contributed very little tangible efforts to Liverpool winning a football match.
The goalkeeper, defence and midfield will all rightly have questions pointed their way but by being associated with our fantastic front-line once again it will likely go under the radar that what is also letting us down is that our first choice number nine is not scoring goals, not creating goals, is dispossessed more often than any of those aforementioned elite forwards and has a pretty sub-par pass completion rate too.
For the most part, the Firmino experiment is failing and the decision not to directly upgrade Daniel Sturridge remains almost as curious as not bringing a centre half to the club.