To be honest though, it depends whether the level scaling is as terrible as Oblivions. Multiple low level enemies should be as hard to take out as one high level enemy.
You could've justified it in Oblivion, in the story - Cyrodiil's going to hell in a handbasket, right, as the storyline progresses. So Bethesda could've justified by having tougher guards with better equipment brought in from other provinces. Would've taken a few simple lines in overhearing conversations: "I hear they're bringing in some more troops from Black Marsh to stabilise Cyrodiil," or, talking to a guard, "I got dragged back here from from Morrowind," "We put in an order with the quartermaster for silver and ebony weapons - and we got them. That's how we know things are going bad." Simple.
Doesn't explain why they don't do jack to help you during the game, granted. "No, I'm sorry. I can't help to tackle a cave full of evil wizards hell-bent on opening up a portal for Mehrunes Dagon. I've got to wonder around the townships and converse awkwardly with the citizenry."
The trouble with all forms of scaling is that there's no feeling of
progression. At level one, get your [censored] handed to you by a guard. Then, at level 10, you should be able to hand him his. But that never happened, so the whole game felt like you stayed at the same level, you never moved or improved.