Do the small teams even try to beat Benfica? I watch most of Benficas games and it seems to me that they are rolling over easily for them and they look beat even when they are standing in the tunnel looking at the Benfica players.
Well... I don't know. My opinion would be inherently biased on this. It's the kind of thing many Porto or Sporting fans whine about ("they try harder against us") when referring to the smaller teams, but I do try to stay away from those thoughts. It would make enjoying our league impossible, I don't know how anyone can enjoy football when they assume all the tables are turned against their team. Same thing goes for refereeing.
Truth be told, Benfica, from 7 years to this part, have been very effective at dispatching smaller teams. There's a big gap between the 3 big and everyone else in Portugal, so the league, besides matches against each other, boils down to how effective the bigger teams are at dealing with smaller teams parking the bus. Since Jesus became their coach, Benfica has been consistently good at this, with a very attacking strategy, plenty of good attacking options to deal with injuries, etc. They aren't nearly as good against the big rivals or strong European opponents, but the consistency gets the job done for them in internal competitions.
I think they get more help from favourable refereeing than from smaller teams rolling over. If they some how roll over it's most likely due to fear or poor expectations from the game, which is in itself Benfica's merit. Porto has been so poor and inconsistent in the last few years, that it's natural that smaller teams feel more confident playing against us. We can go 90 minutes with only one or two attempts on goal, that's how poor we are.
Refereeing is another question. Any individual incident/mistake in their favour is inherently subjective, and hard to gauge fairly as a fan, but when you add them up you get some pretty weird statistical data that rarely happens anywhere else. They've won a league whilst having an opponent sent off in half the matches, and they have gone 3 years with only one straight red from their team. 100 games and only one straight send off. FFS. You don't need to watch the league to know they get some pretty favourable refereeing, it just shouldn't happen.