Power
Burden/ Encumbrance
Capacity
Overall
The system is ok, but is somewhat confusing to some, especially the Burden/Encumbrance rating (is 100 mean it's heavy or does 100 mean it's the best blaster in that capacity).
To hopefully help clarify things, I plan on replacing the Burden/Encumbrance rating with a "Mobility" rating. Heavier or unwieldy blasters will be given lower Mobility ratings while lighter or better balanced blasters will be rated higher. That would make that stat fall in line with the others in that a rating of "100" means the best rating, not the worst, for the category.
The bigger change I'm considering (haven't decided yet) is whether to change the Power and Capacity ratings to numbers based on ALL blasters, not just blasters of a similar size. While this means that small blasters will end up with significantly lower numbers for Power ratings, the problem with the current rating system is that, well, blasters of similar sizes tend to perform generally similarly and that there ends up not being much of a ratings difference, but it becomes somewhat misleading if someone is looking at a CPS1000 with a current Power rating of 90 and thinking, "Hey, that's only 10 points better than the Water Warriors Viper (Power rating: 80)". In a new system, the Water Warriors Viper's Power rating would end up being ~20 or 25 (depending on the other numbers I see for various blasters) while the CPS1000 would probably be tweaked to 80. I should be careful, though, with my own terminology since iSoaker.com does provide a computed "Power Rating" beside nozzle stats that is calculated based on actual measured outputs and ranges. The iSoaker.com Power Rating subjective stat would be based on the calculated one, but tweaked a bit since few blasters have calculated Power Ratings over 40 due to the sheer power of the CPS 2000 (that's given a Power Rating of 100). Most here would probably already be quite happy with blasters performing like CPS1500s that get power ratings of 29 and 22.5 for its two nozzles.
Of course, the problem with rating based on all blasters is that all small blasters end up with rather low iSoaker.com Power Ratings. That said, I am less concerned about this since, well, smaller blasters do tend to have lower outputs and I'll be leaving the Overall rating to take into consideration the blaster's size. Sure, the power on a small blaster may be low, but for its size, it may still overall be a good blaster.
I'm also considering adding in a new rating: "Flexibility" or "Versatility". The idea behind that rating is how adaptive or flexible is a blaster to meet different roles. Does a blaster make a good back-up, but a poor choice for a primary or might is be able to function well in many roles. As with other ratings, this would be a rather subjective rating, but might offer some value to visitors.
Granted, making the above changes to the rating system would take awhile to implement, but I think they'd offer an improvement over the current system.
