If it's only resolution that bugs you, just use the Widescreen Mod.If you cant stand horrible resolution dont play IWD1...
IWD is capable of supporting higher resolutions WITHOUT the Widescreen mod. Open the configuration program and check a box called "Unlock Unsupported Resolutions" (or something similar). The game is beautiful at 1024x768.
Also, the IWD spell system is superior to the BG (and BG2) spell system (you can cast Cause Light Wounds, baby!). The casting graphics are superior as well.
The portrait art, landscape, and soundtrack are excellent (and, imo, better than BG).
You'll have to do without kits and joinable-NPCs (as mentioned by others, NPC mods for IWD do exist).
In summary, the game is worthwhile and exceeds BG (and BG2, too) in several respects.
aWL