Claptrap Robot revolution DLC is crap really. Its not that good, I actually didn't wanted to complete that DLC but somehow did it, its not that good so don't worry about not getting it.
Also about BL2 DLCs, do you really think that you want all the DLCs at all, I mean base game is good 50+ hrs game and you are basically getting 3 games all with 50+ hrs campaigns. I don't think that DLCs of BL2 matter much anyway except maybe Vault Hunter Upgrade which increases the cap of your level, except that all are extension to campaign. Do you want to spend 1000 hrs in a single game ? There are gazillions of games out there for you to play.
TBH If I were you, I would have bought Complete Bundle without even thinking about it. This is coming from someone who have played BL1 and BL2 at length with friends and thoroughly enjoyed it. I have fkin 800 games all platforms combined. Why would I fret with DLCs with short campaign. Witcher 3 is exception coz its DLCs are 20+ hrs long.
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I think they just increased the price of Bundle