Warframe

Harrow is one of those frames I like in concept but just can't find a way to use his kit in a way I enjoy.

Harrow is probably one of my most played warframes. He has great survivability and some very strong weapon buffs which make weapons that have usability issues a lot more viable and fun to use. It is a lot easier to play Harrow if you only focus on modding for solo gameplay rather than team support. Missions I would typically use Harrow for would be Disruption and Survival, and mostly focused on duration and strength.

Condemn works great for quickly freezing important targets like Demolysts in place for easy headshots. It still won't hold them for long but with Harrow's fire rate buff and crit chance, you should be able to kill most Demolysts very quickly. I would not bother using the condemn augment, especially with how easy it is to get energy now.

Penance has a useful interaction with shield regeneration mods like Brief Respite and the Augur set, If you don't have active Overshields with Brief Respite equipped, the shield regen will prevent your shield gating from tripping making it a lot safer to use around enemies. The Augur set is a little better if you can fit one of the mods as it can prevent penance from triggering shield gating even when cast with active overshields. Penance also gives a large boost to your weapons fire rate and reload speed making certain weapons much more usable without wasting mod slots.

Thurible is mostly just used to keep your own energy up and allows you to run around with negative efficiency and always have a cast of condemn ready for emergencies. I don't find Warding Thurible to be very useful.

Covenant and the Lasting Covenant augment are what I usually try to mod for on Harrow. This is mostly for precision weapons or if you loadout is focused around headshots with arcanes like Arcane Pistoleer or single target weapons. If your team is nuking or CC focused with Gloom/Shock motes, it's best to find a group of enemies alone to get your full buff or find a couple exploding barrels to take self damage.

For weapons, generally I like to use snipers, Penance and Lasting Covenant help to work around the lower fire rate and reload speeds, and the Sporothrix is pretty fun with this setup and its Volatile Variant augment. For pistoles, Arcane Pistoleer and anything that's full auto and has a high fire rate like the Twin Grakatas. As long as you're getting headshot kills, it's like running around with an infinite ammo fissure buff. The melee weapon typically doesn't matter, Rakta Dark Dagger to quickly refill shields or the Furax with Amalgam Furax Body Count if you want to have even more fire rate on your pistols. It's also probably one of the few warframes where spearguns like the Scourge and Afentis can be useful.

Man, I love Harrow. Not because he's particularly amazing, just because he's easy and I enjoy him. He's very very good at keeping himself alive, which works for me because I have a massive skill issue.

I keep meaning to try playing other frames more in steel path but I just end up dying a lot because I'm so used to playing Harrow and having a get out of jail free card lol.

I don't understand overshields. What's up with them. They're not the same as overguard?

Harrow always had this weird issue of being a support frame that requires you to be the one actually killing enemies to support your allies. This leads to two possible outcomes: they don't need your support because you are already doing the mission for them or they get your support, upon which they proceed to annihilate all the enemies leaving none for you and thus not letting you actually do your thing anymore. In order to really be able to actually use his entire kit you need to play solo, making him the one support frame that's best at supporting himself. He does have that one augment for Condemn to somewhat help with this issue, but 1 - he really shouldn't need an augment to be able to properly support his allies and 2 - this still has the issue of your allies killing things so fast you don't get a chance to Condemn them at all.