This Bulls team has been winning some ugly games. Games where they haven't particularly played well. Games they could have possibly lost, but games they've largely ended up winning.
They performed well without Carlos Boozer to open the season, and they're accumulating wins so far without Joakim Noah. There are times we want more, pretty much all the time that is, and we definitely want to see the Bulls perform better against the best teams in the league.
However, the Bulls have only played two games against the best when healthy, and they were 2-2. Of those four, the two losses were Boozer's first two games in a Bulls uniform (preseason or otherwise) after returning from an injury which stretches the definition of health.
At best you can take some positives from the Bulls home wins over the Lakers and Thunder, and at worst you should give them an incomplete for falling to tough teams while missing one of their premier players.
However, ignoring the Bulls record against the best teams in the NBA for a moment, let's look at their record against everyone else. I broke down the Bulls record awhile ago here. Since that point, the Bulls suffered their first loss to a poor team (Clippers), one loss to a good team (Knicks), and picked up five more wins against bad teams.
That puts them at 4-9 against good teams, 5-0 against average teams (Houston climbed into average), and 11-1 against bad teams.
Looking at the rest of the schedule, and hoping that I do my math pretty well, the Bulls are set for a pretty sweet run. Of their remaining 52 games, the Bulls schedule breaks down like this:
33 games against teams with losing records. Of those, 27 of them are games where the opponent is really sub par, 6 of them are teams which are at least within a stones throw of .500.
1 game against a team that is .500.
18 games against teams above .500 (these teams are generally quite a bit above .500 right now as the league has become a haves and have nots type of league with a bunch of really bad teams and around a dozen good teams).
If you look at the Bulls general percentages, they're presently 16-1 against the teams that make up 34 of their remaining 52 games. I'll assume that they can't maintain that pace the rest of the season (if so they'd be 32-2 over those games), but we'll say they do a fairly close proximity to it and go 29-5.
The Bulls are presently 4-9 against the type of competition they play in the other games, which I think they'll improve upon down the stretch, but let's say they just perform similarly o that level. They'll go 6-12 against those teams.
That puts the Bulls at 35-17 over the final 52 games and gives them 55 wins on the season.
Looking at what the Bulls have done so far with the injuries they've had, this simply doesn't feel unrealistic to me. I think they can play better than 6-12 against the good teams quite frankly, and while 29-5 is going to be awfully tough against the other squads, it's already toned down considerably relative to the percentage they're actually beating those teams at now.