I have some excellent long-series Bosch drill bits (jobbers). But they are expensive, and not generally available (I get them from the local Bosch pro dealer). To calibrate "expensive", six of the M5 ones were more than 15 quid recently. The 8mm ones come in paper envelope packs of five. They're as good as Presto or Dormer or SKF, and resharpenable if you're careful.
So I don't think it's as simple as Bosch = rubbish. They obviously have a range of quality.
The trouble is that I can't (in a hurry), walk into any other shop in Bristol and buy decent quality drills: those other brands are reliably good, but getting very hard to find, certainly not over the counter here as easily as they used to be had. There used to be a SKF branch here, but I used to end up paying the "not discounted" price, which, like the Bosch good stuff is bordering on ridiculous, so I stopped arguing with them, especially as their opening hours were stupid (closed on Saturdays and weekday lunchtimes - really?).
I really wish you could get Dormer or Presto off the shelf still.