The Guardian is considered significantly politically slanted, right? I don't know how Brexit is going but I'd like to look at several sources with several different world views before I come to a conclusion.
But for Brexit specifically, you'd be hard pressed to find good news about Brexit even on Boris' side, given how it's turned out and what an absolute shit show the government has been the past two years. The Brexit minister just resigned, and he's replaced it with a muppet, mostly for political reasons than competence.
Boris has become very unpopular for many reasons, Brexit one of them, and I bet he's not gonna be the head honcho of the Tory party for much longer. I hope Brexit becomes politically toxic it will become fashionable to rejoin the EU again but let me put down the hopium pipe first.
The traditional, sensible Conservative MPs (Dominic Grieve etc) were forced out two years ago.
The reason why Boris is unpopular now are exactly the reasons why Brexit is in a hole: lies, rules don't apply to us, mindless boosterism, no plans for governing just gaining power, incompetent delivery.
Just one example:
"It will take time, but with regulatory divergence the UK will steadily pull ahead of rivals such as France and Germany which you would normally expect to perform as well as, if not slightly better, than the UK. We will be more innovative, attract more capital, and our companies will seize markets more quickly, than they otherwise would have done. We have seen the United States do that in technology, and now Britain will be able to match it. That is a prize worth having, and it has been secured."