A drop pod? Generally no, as what ever is in the pod (usually on the opponents side, so close to lots of guns) dies fairly quickly to focussed fire
Its when you have multiples - 3 or 5 are a good number. THis lets you bring down 2 or 3 in the first turn, so potetnially 2 or 3 dreadnoughts or Grey hunter melta squads or Wolf Guard terminators taking attention away from everything else you have.
Remember that, even though they are dedicated, you can have units deploy on the table while the drop pod (as it HAS to) goes into reserve - this means you can have empty pods landing first turn if thats what you want (can create walls of AV12 that start to divide up the board) or have full pods landing first turn - making it quite flexible.
However rmember that, once you land, youre stuck walking everywhere unless you have other vehicles.
I like them, but thts because I have Dreadclaw drop pods that my DCCWx2 dreadnought can assault out of