I've flown them in the past to Portugal and Cape Verde, and always had decent experiences. Most recently in June 2021, I had to use a TAP COVID-cancellation voucher from last year that was expiring, so flew from the US to/from the UK (Manchester) via Lisbon. The flights in both directions were on time, not that full, with good service all around. I would definitely consider flying with them again, especially with the cheap prices they are offering these days.
They were near bankruptcy last year and had to be bailed out so I admit I had my trepidations, but overall have nothing bad to say about my recent experience.