I've lived in Brampton (well Bramalea) since 1972, well before consolidation. It has definitely gone downhill over the years, and the slide hasn't stopped yet. The big wake-up call for how much the town has changed was when a gang of teenagers (more than a dozen) smashed out the back windows of a neighbour's house, because her teenage kid was involved in some illegal crap.
You don't want to live anywhere within reasonable walking distance of Bramalea City Centre. If you like the convenience of not having to leave your apartment building to find some weed then go ahead, but most people don't like the extra 'culture' that comes along with that. Keep away from townhouse complexes in the area too, because more and more the units are being rented out to welfare families (frequently welfare cheats), who have no pride of home in them. You'll find garbage around the grounds left by the feral children, who are just turned out by their parents, or by the druggies who use the darker areas in back as a place to smoke up.
When I first moved here you could leave your door open and come home to a locked house. In fact we actually screwed up and did that once, when heading off to the cottage; left the door wide open. A neighbour checked the place out, to make sure it wasn't a break-in, then locked it up for us. The worst thing we ever had to deal with was a couple of little kids who climbed in our open back window, then stole some apples out of our fridge. Now I find improvised bongs in my back yard and both the units, on either side of me, have been vandalized to the tune of tens of thousands in damage, when they were between tenants. As a result I now have a security system that will remotely store data from motion sensing cameras, if they detect and record movement. This is to protect me from my neighbours, not from random thieves.
Then there are the drivers in the area. There's a good reason why we have the worst insurance rate group in the Province. People run cold ambers. People run reds. Stop signs are merely a suggestion, to freely be ignored. An advanced green apparently means that you can keep turning ahead of other traffic, even after the advanced is done, as long as no one has the balls to drive straight out in front of you. The breakdown lane and on-ramps are for passing. Gas stations double as turn lanes. Oncoming traffic lanes are turn lanes, as long as the oncoming traffic doesn't get there first.
I have exaggerated to make a point, but the surprising thing is that I haven't exaggerated by much at all. You will see all of what I have mentioned, in Brampton. If you MUST live there, then stick to the newer areas. They aren't as bad. Yet.