Honestly, McDonalds at Anna Nagar is a kinda cramped place where you cant really feel comfortable with a large group. But this is to be expected, being on such a busy and costly road like second avenue. Im a vegetarian and I find vegetarian food pleasing at this place. Between the crowd and the rush, you probably wont notice the music playing in the background.
Also I find McDs intrusive advertising a bit putting off. Everywhere you see, theres the guy in yellow and red. The staff are friendly enough and they deliver in a reasonable speed. There is a dedicated area that can be booked for childrens birthday parties but I dont find anything special about the party area.