Is the TCL 55P7L good for gaming?

It handles casual console play fine, but the 60Hz panel and lack of HDMI 2.1 mean no 4K at 120Hz or variable refresh rate. Serious gamers should look at a 120Hz set.

Does it support Dolby Vision and Dolby Atmos?

Yes. It supports Dolby Vision and HDR10+ for picture and Dolby Atmos processing through its Onkyo 2.0 speakers. Atmos effects are simulated from two channels, not true overhead sound.

What is the refresh rate?

The panel is 60Hz. That is smooth enough for movies and most streaming, but fast-paced games and sports will show more motion blur than a 120Hz TV.

How many HDMI ports does it have?

It has three HDMI inputs, enough for a console, a soundbar and a streaming stick. None of them are HDMI 2.1.

Does it run Google TV?

Yes. It runs Google TV, which aggregates apps and streaming services and supports voice search through the remote.

Do I need a soundbar with this TV?

Not necessarily. The Onkyo 2.0 Hi-Fi speakers are stronger than most built-in TV audio, but a soundbar will still add more bass and a wider soundstage.