Unreasonable? Not a bit. +1 weapons are fairly common and minor as magic items go. I'd especially expect to see it if a DM were following the advice of the 1e DMG and placing magic items that fit in with the campaign he's running, particularly since they'd be a natural defense in any area in which monsters only hit by magical weapons were relatively common.
That said, once the treasures were placed, it would be up to the skill and luck of the PCs to actually obtain them.
And to then keep them in one piece...see below...
Hopefully they're paying attention, being cautious enough that they aren't blundering into the worst danger areas without having a chance of picking up the some of the bolstering loot first.
Or, if they do blunder into the danger zone, they're on top of things enough to know when to back the truck up.
I have no problem whatsoever giving lots of magic items - particularly weapons - to the party. Why? Because I know damn well they're gonna break the things just about as fast as they find 'em! Right now, the two parties I'm running are levels 3-5 and 2-4 repsectively, and both groups have various magic weapons ranging from +0-with-extras to +3. As DM, does this bother me? Not at all. In fact, it's a benefit if anything, as it gives me a bit more headroom to throw tougher/more interesting opponents at them.
But they still freak out when they see a Rusty!
Ariosto said:
That story business, I think, makes death, item loss and level drain bigger bothers.
It can. Or, depending how you view the greater game, it might not matter at all.
If you see the story as something the *party* develops, with individual characters coming and going, then the bad stuff just becomes part of the story. My favourite analogy here is the party or campaign as a sports franchise, with the characters equating to the individual players on the team. The story would equate to the history of the franchise (the Montreal Canadiens <=> the Dafan D+D campaign), with different players/characters (Rocket Richard, Guy Lafleur, etc. <=> 'Sheh, Rugor, etc.) holding larger or smaller roles, or none, in any given part of it.
But if your view extends no further than your own single character and that's the only character you intend to play, then the bad stuff sucks. But the blame for that lies not with the bad stuff...
Lan-"I ran with those guys"-efan