hawkeyefan
Legend
Sure would - if it's that easy it won't take very long to play through.
All it means in the long run is that their pre-intelligence on the place was a bit faulty.
But nor would it be particularly fun. What's the point of playing out scenarios when the outcome has almost no doubt? It'd be pretty tedious. I'd either narrate the results and move on, or change things up so that the remaining encounters are worthwhile.
Adhering to the script, for me, isn't a justifiable excuse for a boring session.
For example, for whatever reason I was really beating up our poor monk last session. So next session I'll probably make sure to focus a little more on some of the other PCs. Which is about the only place I fudge the dice - if there are multiple targets and no best choice from the perspective of the monster - I'll roll randomly to see who gets hit. So that's the one exception to my rule above. I roll and then decide who should be attacked, ignoring my result.
At other times I'll hold back that second wave, not focus fire if the PCs are having a tough time of it, go after the tank fighter with a super high AC so he can ignore the attacks and so on.
Here's the thing.....people in the real world don't always do what's "optimal". In these discussions, tha tfact is largely ignored when some folks claim that a particular action "makes no sense". Sometimes, people do foolish things. They aren't always totally rational, or they make mistakes.
I think it's much more easy to justify a less optimal action on the part of a NPC than many are willing to admit.
Going the other way, if the party is facing highly intelligent or tactical enemy I'll adjust things on the fly occasionally. The NPC may know the party extremely well, understand their general tactics, know who should be targeted. Sometimes they'll have a spell I didn't think to give them ahead of time and so on. A super genius should be able to think two steps ahead even if I can't.
This is where I think what many classify as "meta-gaming" can really come in handy. The rules can't replicate everything. There would be way more information at a character's disposal from their world than what the DM can provide to the player. That's just a fact, no matter how detailed and descriptive your DM can be.
So adjusting with those kinds of factors in mind is perfectly valid. Granting the villain a spell in order to make the confrontation more interesting or dynamic? That and similar adjustments by the DM aren't just valid, I think they're useful tools for the DM to help simulate the fictional world and its inhabitants.