The league is indeed very open, and has been a lot of fun to watch so far because of that. My concerns for Wigan are mainly about discipline and errors; the Saints game was lost because of poor composure and we certainly didn't help ourselves with the scruffiness of our performance tonight.
That said, tonight we were second best from start to finish for the first time this season, so it's the first time I've been worried with what I've seen from the team. It was painful watching us struggle to contain HKR, missing tons of tackles and allowing offloads time and again. The backs looked very ordinary and the forwards had a go but were ultimately beaten by the more aggressive unit on the night. The saving grace is, as you say, Hull KR put in a poor performance the other week, and their conquerers were smashed tonight at Leigh, so it looks like most of the teams can give each other a run for their money.