Table according to the article (ordered from highest to lowest difficulty):

Team Opta rating Record League Position
Newcastle United 13.8 WLLLW 12th
Bournemouth 25.2 LDDLL 15th
Wolverhampton Wanderers 33.8 LLWLL 16th
Manchester United 39.6 WLWLL 13th
Crystal Palace 43.8 WLDWL 9th
Luton Town 45.8 LLLL 20th
Brighton 47.4 WWLWW 5th
Liverpool 47.8 DWWWW 3rd
Fulham 48.4 WLDLW 10th
Nottingham Forest 48.8 LWLLW 8th
Aston Villa 48.8 LWWLW 7th
Everton 49.2 LLLDL 18th
Brentford 49.4 DWDDL 11th
Sheffield United 50.2 LLLDL 17th
Burnley 50.6 LLL 19th
West Ham 55.8 DWWWL 6th
Arsenal 56.4 WWDWW 4th
Manchester City 58.4 WWWWW 1st
Tottenham Hotspur 66.4 WWDWW 2nd
Chelsea 69.4 DLWLD 14th

Chelsea seems to be in a very bad spot this season.