So, my theory is that Day of the Tentacle had voice so early (as optional add-on packs for those rare systems that could use them rather than part of the base install, that's how early this was; voice packs that could fill up your meager little hard drive) that nobody involved realized that game voice acting was "supposed" to suck. System Shock is another example of the same effect. Both of those games are wonderful and completely stand up to the best of modern voice acting. It wasn't until later that voice acting really started to suck hard.
