
If you want to play Deus Ex there is a fully voice acted mod called Lay D Denton. It’s great. https://www.moddb.com/mods/the-lay-d-denton-project/downloads

That’s not an issue, that’s an rpg: the ability to make different choices (informed and uninformed) leads to different experiences and different events each with knockon effects for thr story. It’s only a problem if the game isn’t clever enough to account for all of the different things you’ve done.
The combat is fine, my only issue with it was the camera trying to get you killed, especially around corners. Still one of the best games Ubisoft have ever made.