The main problem with the Enhanced Editons is that you can no longer obtain the original versions legally, at least not to my knowledge. But otherwise I should say that they thankfully didn't rewrite anything in 1 and 2. The complaints about rewriting were concerning Siege of Dragonspear and changing characterization of certain companions from original BG in SoD. The new content in EEs is universally terrible, but can be fairly safely ignored. The EEs of IWD and PS:T were alright though, added some cool QoL stuff like Tab highlighting in PS:T.