There are lots of variables beyond the switches that determine how loud a keyboard is, as others have mentioned.
However, I do find that Blues add a certain pitch to the already loud enough keys bottoming out that you now have a pretty full-ranged sound. Type pretty quickly for a bit, then stop, and you'll realize just how loud it was. It's fun in shorter applications, IMO. It can even be fatiguing to the ears after enough typing.
Whether or not it's "too loud" will depend on many factors, including your tolerance to noise, others around you, being able to hear music/game sounds over your keyboard, typing while on the phone (in an office), family/spouse/roommates, etc...
I find Browns and Reds to be loud as well, but it's mostly in the lower registers which seems to be less intrusive and deliberate sounding. Still, if I switch from Blues to Browns, my head thanks me, and if I switch from Browns to my Apple BT, then it's nearly dead silent (while being more tactile than my Browns).