I had a lot of fun with Crusader back then.
It's a 3rd person action game in iso perspective. You slowly and carefully blast yourself through huge levels with enemies and traps. There are switches and force fields here and there, a couple of traps, and a lot of violence. The production values were high. Crusader had the best animations, spectacular videos and a nice sci-fi atmosphere.
AFAIK the Crusader is mainly controlled with the keyboard while the mouse was used for aiming. He can roll to the side, jump forward, etc.
It's not an action-adventure as we know it today. More like a shooting puzzle game in which you move from level to level, get through traps, blow up stuff, find ways to safely take out the 3 guards ahead of you. So it has a slow but consistent pace. Talking is rarely necessary, if ever.
It has nothing in common with U8 except the engine.
I think it's definitely worth a look.