I'm in a hunting club(group really i guess) and one of the guys bought 2 Mossbergs on sale at Dick's last week for his 2 sons, one was a 270 and one was a 243. While I agree the scopes are junk both guns grouped half-decently(about 1.25" with reg. Rem c-lokts.) when we all got together this Sunday to sight our guns in. I was actually impressed since this was a $300 package gun on sale at Dicks. Basically he has about $700 in rifles setups and 4 boxes of shells for his boys. No they are not great guns and I personally wouldn't use the scopes that came with them but they should work perfectly fine next week when these guys are in the stands.
Honestly I would bet that el cheapo Tasco's have prob killed more deer then anything. Personally I like to have nicer stuff in the woods but I don't talk down to some of the guys I hunt with who can barely afford our yearly dues let alone an expensive rifles. To some folks $300 for a gun and scope is expensive.
I cannot say anything for the other package guns cause I've never had any first hand experiences with them.