I think the negative reaction comes from some of the zealotry of those that DO use a Bose PAS. 'I like it' and 'I don't' don't really get people's goat up. But the patent cheerleading for this system from many that DO, 'This is the best PA in the world!', 'Nothing even comes close' 'I played a 40,000 arena with ONE sub, and they all partied their brains out!' (OK, that one's an exaggeration!), when waved in front of those of us that HAVE tried it, and found it lacking, especially in low mids and 'punch' (great highs, though) is a little hard to swallow.

Look, I don't even like Bose stereos. They all (IMO) have a 'sound'. And the LAST thing I want to hear is a 'sound' of the stereo itself. I just want the music, as uncolored as possible. I listen to probably 90% of all music through my Mackie HR824's. The rest of the time, it's B&W monitors ($3.5k of them). I think I know what 'flat' sounds like. I work part time as a mastering engineer, for everyone from local acts up to national bands. I would NEVER master anything on a Bose system. They are just too 'hyped'.

Their PA's, same thing. Now, this is just my opinion. I don't try to force feed MY preferences in PA gear down anyone's throat. Would that SOME PAS users would do the same...
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An arranger is just a tool. What matters is what you build with it..!