Doubles is one thing.... I'd say yes, bad form.
If a team is advanced enough to put up a double block against you... game on!!! They should have someone covering the block agains tips etc. There's 900 sq.feet of court and the idea is to put it where they aint

If all you do is tip, well that'll get boring not to mention real easy to defend eventually. You've got to diversify!!! Yes I'm a financial advisor, and yes you too should diversify
