Your wargear is also pretty sub-par, such as the Deathlocks mentioned above, Laslocks which are only S4 Assault 1, and Pariah weapons which again, have rather big drawbacks for what appears to be a small benefit.
Yes and no. Pariah Flamers are bloody amazing. The extra damage afforded by Torrent is terrifying against close-packed infantry. Pariah bolters are okay but not amazing - their best use is as a free swap for normal bolters on breachers - giving the close quarter focused breachers assault weapons instead of rapid fire.
Laslocks aren't amazing but if you want an assault weapon, legion shotguns are. It's a sawn-off stormbolter for one point in a game where you can't take the actual stormbolter
Equally, marauders come with chainaxes as standard. It doesn't sound like much, but any world eater will tell you what it does to Solar Auxillia in their void armour.
Marauders are expensive, but get cheap as you add models, and with two attacks each and paired weapons, are lethal close-quarter fighters.
No rites of war hurts, but the Blackshield traits substitute - Rad Grenades from outlanders are scary, as is S5 T5 chymerae.
You can even make a decent drop list. No, you can't take drop pods. Nothing stops you spending slots on Kharibdyss and Dreadclaw assault craft, though, and the former can carry full marauder and breacher units.
Plus, as noted, the Nemean Reaver is a freakin' boss. He'll make a right mess of the 'generic' Paragon Blade wielding Praetor.