1500 crit is supposed to be a 100% chance to crit, but there is always a slight chance to miss a crit, even if you have over 1500 crit. The 80 dex boost from entrapper giving the char a large boost in crit rate depends on the dex value of the character (the higher dex your char has, the larger the boost from zephyr). A dex paladin can be a great character depending on your set up. Playing normally, you'll want to have at least 1000 crit rate. 1000 crit can be achieved easily using HB set, dex crafts, etc. A dex paladin can only succeed if you ignore vitality all together, which works out considering your block rate.