I have to agree with some others in this thread, I think a lot of the issues people are having can really be boiled down to tank anxiety. My only issue with tanking is that currently, you have one whole combo (aggro combo) that is functionally useless and it makes tanks a little more dull to play compared to more fleshed out dps. One big hope for this expansion is that they add something to make that combo worth using sometimes, but that's another issue.
I'm sure being a GUNChad will be fun, try it!