Some of the fights in the original BG were pretty unforgiving (especially as you were playing extra crappy low-level characters). Fun to beat them, though.
If you want a more ARPG-type experience with an Infinity Engine game, the enhanced edition of Icewind Dale is a blast. Again, some of the encounters can be hard but the IWD:EE allows you to significantly turn down the difficulty if you get really stuck. It gets fun at the higher levels with regards to spellcasters; summon a demon in the middle of a room full of enemy mobs, close the door, and let it get on with it. There's also a lot of stupid fun tricks you can play with exploding skulltraps and delayed blast fireballs.
And since I'm here, here's my perenially unpopular IWD opinion: it's a better roleplayer than the BG series as i) you get to roll your own party, and ii) the sparseness of it all feeds the imagination. The music is also fantastic.
Anyway, getting back on topic. I'd love to give BG3 a shot, but my hardware is laughably underpowered for it.