Technical differences between Titans and EE

Bought EE after not playing titans for years upon years, and it could be my memory playing tricks on me but it felt...really clumsy, to try and use an analogy for it. Even without the new civs (ie: just playing, say, kronos vs ai isis) it felt very off compared to what I remember.

I've heard that EE is quite buggy and unpolished, and just wanted to sanity check whether there are actually technical differences (excluding the new content, there's obviously been things added or changed in patch notes) and changes in the feel of the gameplay, or whether i'm remembering the old times through rose-tinted glasses.

If it's not just me, I guess it's time to go digging through the stack of CDs looking for the old installs.

Thank you.