The biggest issue with the old games, that I had at the time they were new and now, has always been the early game. Looks aside, your character starts weak, has few abilities, and whiffs constantly.
Baldur's Gate 1 is especially guilty of this, where the other infinity engine games seemed to deal with it relatively quickly. Watching 5 toons miss for several rounds on one mob, only to get a lucky crit and kill eventually, gets old and does not really show what the game becomes. They still mostly look good in terms of backgrounds, though the surrounding menu's are usually less visually appealing (though oddly better than something like world of warcraft right now....).