Worth as in the sense of a dollar return, such as investing in ones house...no not at all.
Like LiL PZEV said
"It is NOT financially worth it, and anyone who thinks it is is foolish."
However I do think it is worth it in the sense of personal expression. if you have the money and the time to do then then great. I myself plan to do some mods, especially cosmetically, exhaust, body kit, rims, lights that's it for now.
BLK_SES_11 says "make it your own!"
2011 Focus SES
2005 Taurus SE (DD)-Stock problem child
1995 Thunderbird 4.6 stock---R.I.P :(