@i_like_swords: No way this would be a STOMP for the Republic. The technology gap between the Sith Empire and the Republic isn't significant enough to give them an edge. Through battles such as the Great Galactic War technology of Star Wars never advanced and in fact people began to forget to know how to use some of the technologies due to nobody studying how to use it given they were constantly sent to war. In fact I'd wager the Sith Empire's Superweapons can destroy several fleets of the Grand Army of the Republic at once. The Gauntlet for example can kill ships before they can react to it during HYPERSPACE.
Imperial Intelligence is also a game changer in this war, compared to SIS, Imp Intelligence actually gets shit done. Most of the alliances forged from the underground markets and mandalorion alliances are actually set up due to the workings of Imperial Intelligence. Their agents are trained to assassinate Jedi and Sith traitors, Cipher 9 being a prime example.
The Dark Council members should be noted. While some are fodders with 0 feats, Darth Marr, Baras, Jadus and Nox can definitely defeat countless of clone troopers and Jedi. Darth Marr has been credited to have drove back entire Republic army in the past. Sith such as Darth Mekhis already created powerful superweapons for the Empire in the past. Ordinary Sith Lords can match or best Jedi Knights and Padawans and given most of them never fought a Sith Lord in their life and the Order itself never have done so ever since the Battle of Ruusan, we can expect the Jedi's combat skills to be less greater than some of the average Siths. A Darth like Malgus can already contend and possibly defeat Council member Obi-Wan Kenobi. Lord Fulminisis a renowned Sith Sorceror, was speculated to have destroyed a rebellious city in a storm made of pure force energy.
The Emperor and his personal powerbase is already a massive threat. If this war lasted for years just like the 1st and 2nd Great Galactic War (which I do see happening) Vitiate can already plant his Children inside Republic space. He already did it once to a Jedi Council member, Syo Bakarn. Lord Scourge or the 2nd Emperor's Wrath are noted for their ability to match the best of the Dark Council. The ladder of which has an apprentice that can be used to change the tide of a battle by pinpointing the emotions of someone (She already did it to an entire group of Republic soldiers on Taris before, it stands to say she can can do it again). The Emperor's Guards (Dark Honor Guard) were powerful non-force sensitives that even the Dark Council feared their prowess in combat. Guarsman Lasicar has personally killed six Jedis and murdered over 2 dozen Sith Lord in his life time (Though the details of the murder is not clear, but it still shows that the guards were competing with Force Sensitive force users.) The Dread Masters can already drive hysteria and fear into Republic soldiers and has been known in the past to bring entire fleets of Jedi down, due to them causing insanity and paranoia. Bestia could drop the Seed of Rage into a populated planet such as Corellia, as she did in the past. And the Seed's corruption can mutate entire populations.