I see what he's saying, the team that ends up winning the league tends to break away right from the start. On paper we should win all four of those first games, however we never seem to start the season well, maybe that's due to conditioning (ensuring we peak around the play offs/final rather than at the start of the season) or maybe just a lack of team chemistry early on. The last time we won our first four games of the season was in 2001 when we went on to finish second and make the final. If we win our first four this year I'll be very impressed, even if there are no big sides there.
If it's a run of tough games your looking for though look at mid July - mid August! Bradford away, Leeds home, Saints away, Warrington at home all in a row. How well we stand up to that will have a massive bearing on where we finish as surely all of those sides and ourselves will be in and around the top 6 (sorry, 8
)