Income Tax portal is good if you have to file ITR1. But remember, if you have income from shares/mutual funds, you'll have to file ITR2. Now I hear they have made improvements, but I'm yet to file this year, so can't say how good the portal is for ITR2.
Till last year, they did not even have online filling option for ITR2. And the offline application was a nightmare. I remember when I was filling my dad's return, on the last page it said there was a schedule I needed to fill. I looked and I looked but could not find the option to fill that schedule. I refilled from the beginning on a newer version of the app and same thing. Ultimately after some 10-11 hours of looking, I finally found it hidden in a corner of page which was already 2 levels in from the main flow. The year before that, the Excel template was not compatible with the latest version of Excel. I literally had to find a laptop with older Excel version to fill it.
I'm a chartered accountant and I have been filing returns for friends and family for 10 years, and even now everything except ITR1 makes me want to pull my hair out. So I wouldn't recommend it if you have to fill ITR2.