So ... for these 13 wins, their opponents have a combined record of 86-147 at matchup which translates to a 0.369 winning percentage.
They've played 2 teams with winning records ... the Pistons & Sixers.
They've played the bottom 3 teams in each conference (Hornets, Hawks, Bulls ... Grizzlies, Kings, Mavericks).
This has tanked their overall Strength of Schedule to 3rd easiest to date (they used to be right in the middle).
NBA Relative Percent Index - 2017-2018 - National Basketball Association - ESPN
Schedule picks up in January though ...
vs. Portland
@ Boston
@ Minnesota
@ Toronto
vs. Golden State
vs. OKC
@ Spurs
vs. Detroit
@ Detroit
and then February starts vs. Houston.
January will be the real test of how good this Cavs team is since they'll play the top 3 teams in each conference ... can't really tell much of what this 13+ streak really means yet. It could be a great extended training camp that gets them in good form for January or it could be fool's gold once they play some playoff teams.