Bots in Ranked

There are no official bots in the Ranked gamemode, though it's entirely possible some users are running bot accounts themselves.
User-bots are usually ran for reasons like boosting other accounts, these bots in general are a gross violation of the EA TOS.

Though it's hard to say whether or not you encountered those, there are a lot of players playing the game, of which their skill can vary quite a bit. Some people aren't that good, that's just the risk with playing with random players, which I understand can be quite frustrating.

The official Apex Legends Discord server provides a system where you can easily LFG (Look For Group). I'd assume your chances of getting players that aren't living up to your expectations will be much lower when you play with players via that system.

Discord Invite Link: https://discord.gg/apexlegends

Link to information on how to use the LFG System: https://discord.com/channels/541484311354933258/620856590806941696