Is the LG 65UR340C good for gaming?

Only for casual play. The panel is 60Hz with no VRR and no ALLM, so fast games show motion blur and the TV does not switch to game mode automatically. A console or PC gamer is better served by a set with HDMI 2.1 features.

Does it have local dimming?

No. It is a direct-lit LED TV without local dimming, so dark scenes look washed out compared with sets that dim zones of the backlight. Expect grayish blacks in a dark room.

What HDR formats does it support?

HDR10 and HLG. It does not support Dolby Vision, and without a wide color gamut the HDR improvement over standard content is modest.

Can I mount it on a wall?

Yes. It uses a 300x300 mm VESA pattern, so a standard wall bracket for that size fits. The set is flat and fairly deep because of the direct backlight.

Does it have Bluetooth and smart apps?

Yes. It runs LG's webOS with the common streaming apps and supports Bluetooth for headphones or a soundbar. It has no built-in voice control, so you use the remote.

How does it compare with LG's UQ or UT models?

The UR340C is the more basic set. The UQ and UT lines add better processing, and some sizes add features like a 120Hz panel or wider color. Choose those if picture quality and gaming matter; choose this for a large screen at the lowest tier.