"The Darby garbage", as you put it, is spoken of most often because it was he and Scofield who devised a way to broadcast the mistaken assumption of a "rapture" to a wide enough audience to start a modern fad.
If we want to be totally fair and judge righteously -- as commanded by the Lord -- then we need to accept the facts that:
1. Neither John Nelson Darby nor C.I. Scofield wrote or promoted "garbage". That kind of malicious attack does not belong among Christians, and comes from the Accuser of the Brethren. And before anyone says anything further, I will challenge you to acquire a Scofield Reference Bible (pre 1930) and show us one thing in that Bible which can fairly be labeled as "garbage".
2. Both these men (and others who were also well known and held to a Pretribulation Rapture) were Christian brothers who were regenerated and saved by grace and Bible scholars. They were also engaged in the Lord's work, and for Christians to hurl insults at them reflects very poorly on those who attack them. Indeed, it reveals insecurity on the part of the attackers.
3. Christians should be grateful that some brothers took the time and made the effort to study the Scriptures in depth, rather than swallowing prevailing dogmas which had no basis in Scripture. Any diligent student of the Word can discover for himself that the coming of Christ for His saints was always IMMINENT. So if Christians in later centuries brought this doctrine to light, we should be grateful, not throw dirt on them.
4. The Pretribulation Resurrection/ Rapture is neither a "mistaken assumption" nor a "modern fad". Christians should be crystal clear that the Tribulation and the Great Tribulation are for the unbelieving and the ungodly. This is a period of "troubles" and judgments for those who are outside of Christ and have rejected God and the Gospel of the Lord Jesus Christ. For anyone to promote the idea that the Tribulation is for the Church is to promote nonsense. There is not one single mention of "the church" or "churches" from Revelation 4 to Revelation 18. These chapters are descriptive of the Tribulation and the Great Tribulation (also called the Day of the LORD in the OT).