1) She is not too bright.

- After clearing out Brittleshin Pass (entered on the south side), Lydia immediately say, "Look! A Cave!" Well... ummm... yea. We were just IN there!

2) She is not very healthy.

-Trying to sneak my way through Cragwallow Slope retrieving Enthir's staff, Lydia comes down with a cold or something. I swear she *coughed* every 10 steps!

- During any long conversation (like the Graybeards), she is coughing all over everyone present.

Any other general observations/thoughts about Lydia?

1 stands for every follower, they just aren't scripted to know what dungeon you just cleared.

Never noticed the 2nd thing, but in general, I'm not sure why do people like her so much. Maybe because she was the first follower they got? I don't like her any more than any other generic follower, 90% of her dialogue consists of "Yes my Thane", and basically, it's like having a robot, or a person that got a lobotomy to follow me.

IIRC they're all pretty generic. The only one Beth bothered to give some rudimentary character was the little emo vamp, and even she has these "I want to be somewhere else"-issues...

Followers are not exactly a forte of TES games. The best ones so far in Beth games are found in the Mojave...