Also remember that many of the nerfs on spells are also to the PCs benefit. With 3.0/3.5 allowing classed humanoids it's quite likely that a first level party might encounter a kobold sorcerer who can cast sleep against them. If a spell is insta-win in the hands of a PC group it becomes insta-win as a NPC tool against equivalent level PCs. Considering that the NPC sorcerer doesn't need to reserve his sleep spell for later on in the day he can blow his most powerful spells early.
1e versions of sleep, web, stinking cloud, cloudkill would likely increase the percentage of encounter that end in a TPK which is generally seen as unsatisfying to the gaming experience
1e versions of sleep, web, stinking cloud, cloudkill would likely increase the percentage of encounter that end in a TPK which is generally seen as unsatisfying to the gaming experience
