Good choice Darth, Mass Effect is an epic game with an amazing story and combat system. I wouldn't put it at the same level as KOTOR, but it's pretty good nonetheless 
Do you have ME2 as well? The continuity effect of both games is pretty well implemented, and you'll actually see that some choices that you have taken in ME will effect ME2.
In my opinion though, ME1 is by far the better game, with the best story and interface. Hope you enjoy it 
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
