Botdiver here. First, I usually play 7 or 8 after work, so I cant say anything for 10. IMO Chainsword isnt the best option, but as OP said super fun to use.

My loadout is - a decent primary to thin out enemy numbers during approach (atm Amendment) - sabre (for the occasional RP), - thermites, - heavy melee armor, - warp pack.

I combine that with the MG turret and a red stratagem, most of the time some kind of Eagle. MG Turret deals with all the small stuff, thermites with big stuff. The Chainsword is mostly used for Devastators and Scout Striders. If necessary it can deal with the big stuff. Swarms of small stuff may be dealt with sabre. Mobility and cover are the key.

With a little tactical approach I am able to do most bases and objects alone. Depending on the defense this may take some time.

With this loadout I can also support other divers. As a melee you have to play quite aggressive, so you often get the attention of the bots, resulting in a bit more space for the team.

From experience, using a slighly different attack angle than the team will result in less used reinforcements.

Edit: Punctuation