Terrible is a strong word, but I don't think these terms are good for lots of companies. Each company is at a different stage when they first start raising seed funding. Some companies might just be worth 1 MM, but if you have a strong team, great technology, a workable plan, and early customer interest/revenue 1 MM is a horrible deal. In my opinion these terms are great for some ventures and absolutely horrible for others. I think the quick decisions are great, but I would think it would be more fair and equitable for you not to box the valuations. Perhaps offering a tiered option where higher value ventures take a little longer to evaluate, but I think boxing the valuation will have you miss the best companies. My two cents anyhow.
I think it's best for super early stage ventures. If you're much further along, it's going to be a bad deal and possibly deter any future investment in your company due to the dead money (lack of follow-on).