Since this turned into an 'SP vs MP' thread, I guess I'll add my input as one of the oldest still-active players.
The MP sucks. Plain and Simple.
I tired to defend it for a while, since the fundamental stuff (the feel and functionality) were good, but massively OP fleet comp-stomps and progression-based fleet building (not helped in the slightest by penalising those who lost a lot of ships with high repair costs) just completely killed it not long after arrival.
It never seemed able to shake the dominance of one or two fleets over everything else, and credit to Tindalos for trying to fix things with the dramatic Ork Kannonz nerf, nerfing the Eldar and nerfing Nova Cannons (to the point of useless gimmick status sadly). Never did touch the Tau though, which have... dubious balancing at best.
The SP, however, was better. Story was solid, some cool mechanics and ideas presented in the campaign, and excellent voice acting and overall thematic feel. There was also a good introduction for new players into how to play the game, and a slightly more forgiving environment to experiment with the progression system. However, even this had problems. The Campaign we got was bloated with repetitive missions that played just like Skirmishes (which made the game overall get very repetitive after 200+ hours), the campaign was too short if you striped away these grindy elements, and the one campaign with Imperial Navy was all we got.
There is a lot of room for improvement, but BFG1 was a solid game despite all the downfalls. So I'm cautiously optimistic for the future of this new game, as it is building on strong foundations, and the promise of more content in all categories was certainly a surprise for me. Hopefully the promise of multiple campaigns is actually meaningful, and not simply the DoW: Retribution copy-paste treatment, especially since BFG1s campaign was very boring at times...