META Tags - Meta tags are dead baby. Well not quite dead but they are only used as a point of reference for search engines. It's a shame to see websites that have their META tags still stuffed with keywords. It's pointless. Put your primary keywords in the Meta Keyword part of your webpage but apart from that don't lose any sleep or waste any energy on them.
Title, Meta Description and meta keywords is not the stuff which take your much time, you can just do it in a couple of minutes.
Title - may consist of 3-4 of your main keywords related to that particular web-page
Meta Description - may consist of 8-9 words describing the particular webpage
Meta keywords - use 4-5 keywords withing this.