Just to play Devil's Advocate; Reasons you may not want a Polaris.
1) Price. Not just the fact that this is enough money for a weekend trip to the beach, theres a fuckton of ships you can get for 750 dollarydoos.
750 Bucks could buy you a Super Hornet, Gladiator, Retaliator, and Vanguard. That's a lot of firepower.
Or it could get you a Carrack and Terrapin with enough leftover for an M50.
Or in my case it gets me a Caterpillar, 2 Cutlass Blue, a Buccaneer, Herald, and 3 Dragonflies. That's a lot more versatile and easy to find a place to use it at than a Polaris.
2) Operational Costs. The Polaris is a big, expensive ship. Most likely big, expensive ships are going to be expensive to repair.
With possibly needing to buy
-28 S6 torpedoes
-Ammo to reload 10 (or more, depending on what size the automated chin turret guns are) S4 guns worth of ammo, and possibly your fighter/Gladiator buddy too.
-Fuel to power those 6 big engines
-Missiles for your 2 automated missile launchers
Even if you take no damage at all, you are likely going to need a lot of incoming money to offset the running costs. The upgrade and/or cargo insurance premiums are probably going to be pretty high too, that's a lot of equipment to replace.
3) Replacement time. It's going to suck, but eventually your Polaris will get wasted, or damaged beyond repair. While it's the smallest capital ship, it's still a capital ship and will have a vastly higher replacement time than a Cutlass or Hornet. CIG has said they are planning on making ship replacements exponentially higher for larger ships, and based upon supply and demand. So if you're 45th in line for a Polaris because a big war broke out between TEST and another big faction, but RSI can only pump out 15 a week for instance, wellllll you better crew up with someone else because it will be a while before you get your baby back.
4) Crew requirements. Polaris needs a good chunk of players to run effectively. With 7 Crew stations (5 on the bridge, 1 Engineering, 1 Torp Room), 5 turrets to man, and a Hornet/Sabre/Gladius/Gladiator pilot that is a large number of people to run a ship. It's easy to say "oh we have shittons of people in TEST so you'll have no problem finding people", but its another to find 7-13 people who want to crew your Polaris for however long you want to be in it for that play session. One person has to leave? Welp you're down to an NPC covering you then.
5) The Capital Ship Dilemma. Capital ships are big and expensive. You know what my dream is to find and pirate in the PU? A solo capship, because I can steal that shit. Capital ships are the linebacker of a team. They are the center of your formation tactically, if not literally. A capital ship without proper support will get death by a thousand papercuts, torpedoed, or boarding in short order. The Polaris is a combat powerhouse, but it is not a turret covered monster rape engine like the Javelin is.
The Polaris will be great as the flagship of a fleet, being a heavy escort for merchant vessels, leader of a scout fleet for a combined arms fleet of Idrisi/Javelins, and many many other uses. What it should not do is run solo. Even with a fighter you can carry you will likely need backup in lowsec and certainly nulsec space. Which tacks on to the crew requirement; not only do you need to find X players to help crew your ship, you need X ships to help screen and escort you.
This is not to say that you shouldn't buy a Polaris, but it's great upsides (great combat capability, great multi-crew and teamwork potential) are countered by some downsides that may not be for everyone.
For me, what made me decide to get a Polaris in game rather than melting down most of my ships was I would rather start with stuff I know I can find a place to use it. I can haul cargo in my Cat, use it for piracy missions, SAR, troop transport. I can fight in my Cutlass or Buccaneer, escort convoys, go raid rival mining or salvaging groups, do some light exploration. Do some EWAR, hacking, data-running in my Herald. Etc etc. Whereas with the Polaris, I can forsee instances where I would need to keep it in the hangar because I cannot afford to use it, or it's simply too big for that given purpose.
Just my 2 UEC homies.
