re: Is this Rangers rotation the worst of all time?

There are several young pitchers in the system now but some are just not ready yet. I think Luke Jackson will be up next (most likely in September) and Chi Chi should be called up sometimes next year.

A lot of depth has been lost over the years because of the trades to get players like Matt Garza, Ryan Dempster, Geovany Soto, Mike Adams, Cliff Lee, etc. The pitching depth has taken a toll but honestly out of everyone who has been traded over the past few years the only ones I think that may have even helped this year would have been Justin Grimm and Neil Ramirez just off the top of my head.

I agree with you about Colby. I didn't like them bringing him back last year on a contract (despite him not pitching) but it appears like it put them in a weird position where they felt they needed to be loyal to him two years in a row and give him another chance. Nothing against Colby at all but he shouldn't have even been considered to have been in the rotation this season even before all the injuries occurred.