Compelling, involving and revolutionised CRPGs. I bought a new PC just so I could play the TOSC expansion!
Compared with the 3D graphics and flexibility of the Neverwinter Nights camera system those in BG do look dated now but if you've never played a CRPG then this is the place you have to start. An epic plot with engaging characters it's not to be missed. Follow it up with the expansion and Baldur's Gate 2 and you'll have hundreds of hours of RPG bliss. Finished the game solo (?) then play with a friend and add a new dimension to the experience. It's worth buying an old rig just to be able to play the BG series co-op.
I loved it so much I'd happily let it steal my life again.