A player has to get some support from other players. Vice versa, he has to provide support for other players too. All including to function. No human or alien can play alone in a team sport.
What makes Messi different is because of how he creates, combines and finish with equal balance. And all with extreme statistic. Scores as crazy as he give assist, create chances, withdrawing defenders etc. And the fact that Barca lack creator, especially in CL this season, other than old Iniesta, makes his job even more demanding. When he is not on form (which can happen to any human), the team vanish.
What Suarez did last night is one example when things are going right. With the right player in the right moment, he full fill one of his role as a scorer. Some other times it's Alba, some other times it's Iniesta etc. Some other times, he's the assist maker. The third goal is particularly genius from Messi-Suarez.
So, why did Roma match is always the topic? It's a mistake, more on EV in rotation and defensive tactic. It's not fair to judge a whole season from one single match. If Barca scored just one and penalty didn't happen for Madrid, the comment would be like total opposite.
Time to appreciate the players more, league is far harder than CL. Like I have said, with Cou and Arthur next season, and developing Dembele, everything will go much smoother. Hopefully.