I would say my Boardmans frame is decent, wheels didn't last long, brakes (BB5) I personally hated, bottom bracket was replaced, but it's going back in as 400miles later it's starting to fail again.
In fairness to the bike I had heard that the BB used is a little sucky and many people complain about them.
Would I buy another Boardman? not from Halfords, they talked me into getting a Hybrid, something I now regret and I wish I had gotten a road bike as planned, they advised against it, I was on the fence a little but now a year later I am saving like crazy to get a road bike, also I feel as if the frame is a little undersized for me? it's 54cm I am just over 183cm with an inner leg of around 89cm.
Again many of my issues aren't with the bike, but as Halfords are the main outlet your stuck with them unless you buy 2nd hand, also when I have gone back to Halfords for tweaks and adjustments I don't feel like they have listened to me and just taken the bike for a day and called me later to say it's done.