I think the season so far has been good, but not spectacular. 

I'm definitely feeling it too. It's by no means bad or falling in quality, but there's definitely something I'm not feeling compared to the other seasons.

I still say personally it's likely due to the mane 6 across the span of 6 episodes. NSP was the first appearance of AJ, FS and RD since the premiere and even then the latter was in it for only one scene and all 3 still didn't contribute much. While it's a good idea not to shoehorn all the characters if they aren't needed, I can't help but be left hanging when they're absent for that long

That's kind of how I'm feeling. The current season isn't bad or anything, but.. eh. It's been pretty difficult for me to get truly "invested" it. I'm guessing it's because after 5 years or so, there's been other shows that I feel have done better than MLP and it feels more like the "elder" of other great cartoons, not to mention tons of other interests I've been getting into, but whatever it is, S6 isn't bad, just rather underwhelming compared to previous seasons.

yeah I have that feeling aswell ,something is missing

I'll admit, I can get this feeling every now and then, too. Season six not objectively bad by any measure, but, like what @ said, it feels a little underwhelming thus far. Whether it's because other cartoons are better than FIM thus far, other interests, length of the series, or spending time in school, I don't know.

I will say this. It's certainly not because of other cartoons, because MLP is the only animated show i watch. But i have certainly other interest besides this and i've watched this show for so long now.

I will continue to watch the show of course. Maybe by the half of the season, i can have a better result.

I haven't been on quite the same level as I was with Season 5 by this point. Majority of the episodes have been average to me at best, with a few stand outs.

Don't think there is any special reason for it. Shifts happen, and I don't expect every episode to reach new heights. I'll just keep watching and taking it one at a time.