The Epl this season has been one ironic one where can say even the top four teams as not be consistent to be frank but at least Liverpool still doing better than others especially against the Gunners who I thought might be the favourite this season since Manchester City are having an unfortunate spare thus season.
But above this, I don't think other domestic leagues can criticise or judge the EPL for their lower points in comparison to past years. EPL teams are still doing well in the UEFA competition, if they can go far this is a good thing or regulations
I agree with you that this season English Premier League has been very unpredictable. Even top four teams have had trouble playing well all the time. But Liverpool has been different they have played very well especially against Arsenal who many people thought would be best team this season. Fact is that Manchester City is not doing well this season has also made things more unpredictable. Even though teams in EPL are not getting as many points as they did in past I do not think other leagues should criticize EPL. The way EPL teams are doing in European competitions shows how strong league is and if they can keep doing well it will be good for league reputation.
Because this season only Liverpool did not have any problems with their players, if there were any absences it was only in few match and different from other team such as Manchester City and Arsenal who had to deal with problems related to player crises several times.
Even so, the Premier League remains one of the biggest and most popular league, competition like this with significant decline in team is natural thing to happen, and you are right at least in European competitions several team from the Premier League can still play well and can be said to be quite dominant for some time now.