10-9: Perfect, or near perfect. One of the best Star Trek episodes ever.
7-8: Great! Not as perfect as it could be, but nonetheless a very, very enjoyable episode. No real complaints.
5-6: Good. Not one of the best episodes ever, but very good. Some minor nitpicks or quibbles, but overall a fine, average episode.
3-4: Below Average. Some issues here and there that seriously affect my enjoyment of the episode, but also some redeeming qualities that make it worthwhile. Not bad, but not good either.
1-2: Poor. An episode full of schlock that's hardly worthwhile.
5 out of 10 looks bad on paper, but it really isn't a bad score according to my scale.
To give you an idea of rated other Trek seasons, here are my ratings for TNG season 7:
Descent P2 5
Gambit P1/2 8
Dark Page 3
Force of Nature 3
The Pegasus 7
Sub Rosa 4
Lower Decks 7
Thine Own Self 7
Eye of the Beholder 5
Journey’s End 8
Preemptive Strike 9
All Good Things P1/2 9
See, it baffles me how you consider "Emergence", "Homeward" and "Interface" better than "Phage". I thought Phage had a great mixture of tragedy, humor, suspense and the introduction of a fascinating villain and a great scene where Janeway confronts them. I also wouldn't consider "Emanations" on the same low level as "Forces of Nature" or "Masks". Both those were incomprehensible messes, I thought "Emanations" did a decent job exploring death and the afterlife.
Likewise I think the concept and well written drama of "Faces" would elevate it above episodes like "Interface" and "Emergence"
Well its good you're enjoying it so far at least, but you're definitely a harsher critic than me since I would classify 5 season 1 episodes as "excellent"! It will be interesting to see what you think of future episodes, keep us updated!